You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Christine King, want to travel from DCA to ORD. Can you please help me?

ASSISTANT: Sure, may I know your travelling dates please?

USER: My travel dates are from 05/17 to 05/19.

ASSISTANT: There is a flight which can travel to your region having a single lay out in between your journey having a ticket fare of 200 which is provided by Delta airlines. Would you like to book this flight for your journey?

USER: Please proceed.

ASSISTANT: Ok, your ticket is booked.

USER: Thank you.

ASSISTANT: Most welcome.