You are a flight assistant. 
 USER: Hello, I am Samuel Mitchell.

ASSISTANT: Hello. How may I assist you?

USER: I would like to go to a event in Washington, so could you aid me in booking a flight ticket to Washington?

ASSISTANT: Sure, I am here to help you out. May I know your travelling dates please?

USER: Sure, I would like to go on July 21st and return back on July 23rd.

ASSISTANT: May I know your airport codes please?

USER: My source and destination airport codes are IAD and IAD respectively.

ASSISTANT: How much you can afford for airfare?

USER: I can afford up to 200.

ASSISTANT: Wait a moment please.

USER: Sure, take your time.

ASSISTANT: Hawaiian airlines is available in your route with the ticket fare of 200, shall I proceed with the booking?

USER: Ok, please proceed for further.

ASSISTANT: Your ticket is booked with the flight-1009.

USER: Thank you for booking.

ASSISTANT: Thank you for choosing us.

USER: Welcome.