You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: Can you please reserve me a flight ticket from DTW to SFO to meet my childhood friend?

ASSISTANT: Sure, when you are planning to travel?

USER: I am planning to depart on Nov 10 and return on Nov 12.

ASSISTANT: Ok, do you have any other specification?

USER: My return time should be morning.

ASSISTANT: Ok, please wait a minute.

USER: Sure.

ASSISTANT: Thank you for waiting and we do not have found any flight as per your requirements.

USER: Ok, no problem.

ASSISTANT: May I know your name please?

USER: My name is Christopher Williams.

ASSISTANT: Thank you for approaching us.

USER: Thank you for your response.