You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am planning for the vacation to Oakland, OAK, so please book me a flight ticket from PHX.

ASSISTANT: May I know your trip dates?

USER: My trip dates are 10/19 and 10/21.

ASSISTANT: May I know your name?

USER: I am Jessica Moore.

ASSISTANT: Sorry, there is no flight found with your requirements.

USER: It's ok, no problem. Thank you for the information.

ASSISTANT: Thank you.