Try to do this: 

<field name="x_quote_pickup_city"/>
<field name="x_quote_delivery_city"/>    
<field name="x_quote_value"/>
<span t-if="x_quote_pickup_city.raw_value and x_quote_delivery_city.raw_value">
    <t t-raw="x_quote_pickup_city.raw_value"/> →
    <t t-raw="x_quote_delivery_city.raw_value"/>

</span>

I hope this works

@Celia, I tried and get the following error message upon reloading the page:

Uncaught TypeError: Cannot read property 'raw_value' of undefined
https://erp.ontruck.io/web?debug#view_type=kanban&model=crm.lead&action=146&active_id=3:46
Traceback:
TypeError: Cannot read property 'raw_value' of undefined
    at Engine.eval (eval at <anonymous> (https://erp.ontruck.io/web/static/lib/qweb/qweb2.js:402:33), <anonymous>:46:33)
    at Engine.QWeb2.Engine.QWeb2.tools.extend._render (https://erp.ontruck.io/web/static/lib/qweb/qweb2.js:391:58)
    at Engine.QWeb2.Engine.QWeb2.tools.extend.render (https://erp.ontruck.io/web/static/lib/qweb/qweb2.js:383:26)
    at Engine.QWeb2.Engine.QWeb2.tools.extend._render (https://erp.ontruck.io/web/static/lib/qweb/qweb2.js:413:29)
    at Engine.QWeb2.Engine.QWeb2.tools.extend.render (https://erp.ontruck.io/web/static/lib/qweb/qweb2.js:383:26)
    at OdooClass.Widget.extend.init_content (https://erp.ontruck.io/web_kanban/static/src/js/kanban_record.js:67:34)
    at OdooClass.Widget.extend.init (https://erp.ontruck.io/web_kanban/static/src/js/kanban_record.js:42:14)
    at OdooClass.prototype.(anonymous function) [as init] (https://erp.ontruck.io/web/static/src/js/framework/class.js:89:38)
    at OdooClass.Class (https://erp.ontruck.io/web/static/src/js/framework/class.js:106:33)
    at OdooClass.Widget.extend.add_record (https://erp.ontruck.io/web_kanban/static/src/js/kanban_column.js:141:22)

Here is my entire code for your reference: (your solution starting on line 44)

<?xml version="1.0"?>
<xpath expr="//kanban" position="replace">
	<kanban default_group_by="stage_id" class="o_kanban_small_column">
		<field name="stage_id" options="{&quot;group_by_tooltip&quot;: {&quot;requirements&quot;: &quot;Description&quot;, &quot;legend_priority&quot;: &quot;Use of stars&quot;}}"/>
		<field name="color"/>
		<field name="priority"/>
		<field name="planned_revenue"/>
		<field name="user_email"/>
		<field name="user_id"/>
		<field name="partner_address_email"/>
		<field name="message_needaction_counter"/>
		<field name="tag_ids"/>
		<field name="partner_id"/>
		<field name="active"/>
		<field name="company_currency"/>
		<field name="x_quote_pickup_city"/>
		<field name="x_quote_delivery_city"/>
		<field name="x_quote_value"/>
		<templates>
			<field name="date_deadline"/>
			<t t-name="kanban-box">
				<div t-attf-class="#{kanban_color(record.color.raw_value)} oe_kanban_global_click">
					<div class="o_dropdown_kanban dropdown">
						<a class="dropdown-toggle btn" data-toggle="dropdown" href="#">
							<span class="fa fa-bars fa-lg"/>
						</a>
						<ul class="dropdown-menu" role="menu" aria-labelledby="dLabel">
							<t t-if="widget.editable"><li><a type="edit">Edit</a></li></t>
							<t t-if="widget.deletable"><li><a type="delete">Delete</a></li></t>
							<li t-if="! record.active.value"><a name="action_set_active" type="object">Unarchive</a></li>
							<li t-if="record.active.value"><a name="action_set_unactive" type="object">Archive</a></li>
							<li><ul class="oe_kanban_colorpicker" data-field="color"/></li>
						</ul>
					</div>
					<div class="oe_kanban_content">
						<div>
							<field name="tag_ids"/>
						</div>
						<div>
							<strong><field name="name"/></strong>
						</div>
						<div>
							<span t-if="x_quote_pickup_city.raw_value and x_quote_delivery_city.raw_value">
								<t t-raw="x_quote_pickup_city.raw_value"/> →
								<t t-raw="x_quote_delivery_city.raw_value"/>
							</span>
						</div>
						<div class="text-muted">
							<t t-if="record.planned_revenue.raw_value"><field name="planned_revenue" widget="monetary" options="{'currency_field': 'company_currency'}"/></t> <span t-if="record.partner_id.value"> - <t t-esc="record.partner_id.value"/></span>
						</div>
						<div class="text-muted">
							<t t-if="record.date_action.raw_value and record.date_action.raw_value lt (new Date())" t-set="red">oe_kanban_text_red</t>
							<span t-attf-class="#{red || ''}">
								<field name="date_action"/>
								<t t-if="record.date_action.raw_value"> : </t>
								<field name="next_activity_id"/>
							</span>
						</div>
						<div class="o_kanban_footer">
							<field name="priority" widget="priority" groups="base.group_user"/>
							<t t-if="record.message_needaction_counter.raw_value">
								<span class="oe_kanban_mail_new" title="Unread Messages"><i class="fa fa-comments"/><t t-raw="record.message_needaction_counter.raw_value"/></span>
							</t>
							<img t-att-src="kanban_image('res.users', 'image_small', record.user_id.raw_value)" t-att-title="record.user_id.value" width="24" height="24" class="oe_kanban_avatar pull-right"/>
						</div>
					</div>
					<div class="oe_clear"/>
				</div>
			</t>
		</templates>
	</kanban>
 </xpath>           

PS this is for the "CRM - Leads Kanban" view.