You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you?

USER: I am Christine Smith. I would to book a flight ticket from OAK to DEN.

ASSISTANT: Sure, can I know your preferable dates?

USER: I am planning to start on 12/15 and return back on 12/17.

ASSISTANT:  I found a flight 1011 of AA airlines matches with your preferences, can I proceed?

USER: Yes, please proceed.

ASSISTANT: Your ticket is booked.

USER: Thank you.

ASSISTANT: Thank you, have a good day.