You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, may I know your name please?

USER: I am Debra Gonzalez.

ASSISTANT: Ok, what help you are looking for?

USER: I am searching to book my flight ticket.

ASSISTANT: Ok.

USER: I would like to travel CA - OAK on 02/26.

ASSISTANT: Ok, please provide your return journey details.

USER: My origin is TX - HOU and want to return back from OAK on 02/28.

ASSISTANT: Sorry, no flights found.

USER: Ok, fine. Thank you.

ASSISTANT: Thank you.