You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Mark Clark.

ASSISTANT: How may I assist you?

USER: My friend has invited to attend a party at Washington. Can you help me in booking a ticket?

ASSISTANT: Sure, please provide your nearest airport codes.

USER: The source and destination airport codes are ATL and IAD respectively.

ASSISTANT: May I know your travelling dates please?

USER: I would like to travel on dates 03/21 and 03/23.

ASSISTANT: Please wait a minute.

USER: Sure, take your time.

ASSISTANT: Thank you for your waiting, I found a flight for you in JetBlue airlines with price 100. Can I proceed?

USER: Please proceed for booking the ticket.

ASSISTANT: Ok, your booking is confirmed with flight number 1021.

USER: Thank you for your service.

ASSISTANT: Thank you for choosing us.