You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I'm Daniel Williams.

ASSISTANT: How can I help you?

USER: I am planning to attend music concert at HOU, can you please help me with booking a flight ticket from SFO?

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

USER: Sure, I would like to take off on 05/16 and return back on 05/18.

ASSISTANT: Daniel, there are no flights available on those dates.

USER: Ok, no issues. Thank you for checking.

ASSISTANT: Thank you so much for reaching us.

USER: You are welcome.