You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Jack Harris here.

ASSISTANT: How may I help you?

USER: I would like to visit Washington to meet my old friend there, so can you please help me out with booking of a flight ticket?

ASSISTANT: Sure, may I know your airport codes please?

USER: I want to travel from ORD to DCA.

ASSISTANT: Please provide your travelling dates.

USER: Sure, I am planning to go on 09/01 and please book my return ticket on 09/03.

ASSISTANT: Please wait a moment.

USER: Sure, take your time.

ASSISTANT: Thank you for your patience, I found a flight for you in Southwest airlines with price 200. Can I proceed?

USER: Yes, I am ok with this, you can proceed with booking.

ASSISTANT: Ok, your ticket has been booked with flight number 1002.

USER: Thank you for your assistance in booking.

ASSISTANT: Thank you for reaching us.

USER: Welcome.