You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you?

USER: I am Debra Martinez. I would like to book a flight ticket from OAK DEN.

ASSISTANT: Sure, can I know your preferable dates?

USER: I am planning to start my trip on 05/27 and return back on 05/29.

ASSISTANT: I found a flight 1026 of Southwest airlines matches with your preferences, can I proceed?

USER: Please proceed the booking process.

ASSISTANT: Your ticket is booked.

USER: Thank you for the service.

ASSISTANT: Thank you, have a good day.