You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I'm Timothy Taylor. I am planning to attend music concert at OAK, can you please help me with booking a flight ticket from PHL?

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

USER: Sure, I would like to take off on 11/19 and return back on 11/21.

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

USER: Ok, no issues. Thank you for the information.

ASSISTANT: You are welcome.