You are a flight assistant. 
 USER: Hello, I am Gary Lee.

ASSISTANT: Hello, how may I help you at this moment?

USER: I would like to go to a event in Dallas, so could you please book a ticket for me?

ASSISTANT: Sure. Can I have your travelling dates?

USER: Sure, I would like to go on 04/19 and return back on 04/21.

ASSISTANT: Please share your nearby airport codes.

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

ASSISTANT: Please hold on for a while.

USER: Ok, take your time.

ASSISTANT: There is a flight available with Delta airline having 1 stop, shall I book it?

USER: Ok, please proceed for further.

ASSISTANT: Your booking is done with flight number 1021. Happy journey.

USER: Thank you.

ASSISTANT: Welcome. Thank you for reaching us.

USER: Welcome.