You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Myself Debra Clark from Oakland. I would like to visit Phoenix next week for attending a business meeting there. Can you please help me in booking flight ticket?

ASSISTANT: Sure, may I know your planned travel dates please?

USER: Thank you for your positive response, I want to take off on 05/11 and please confirm my return ticket also on 05/13.

ASSISTANT: Can you please share your source and destination airport codes?

USER: I would like to fly from OAK and destination airport is PHX.

ASSISTANT: Please wait for a moment.

USER: Ok.

ASSISTANT: Sorry for the inconvenience, there is no flight available on your requested dates.

USER: Oh! It's ok no problem.

ASSISTANT: Thank you for approaching us.

USER: Thank you for your information.