You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I guide you?

USER: I am Mark Hill. I would like to book a flight ticket from IAH to IAD.

ASSISTANT: Sure, can I know your preferable dates?

USER: I am planning to start on 06/04 and return back on 06/06.

ASSISTANT: I found a flight 1021 of JetBlue airlines matches with your preferences, can I proceed?

USER: Yes, please proceed.

ASSISTANT: Your ticket is booked.

USER: Thank you for your kind help.

ASSISTANT: Thank you, have a good day.