You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Joseph Campbell.

ASSISTANT: How may I help you?

USER: Can you help me in booking from DTW to SFO?

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: My travelling dates are from May 5 to May 7.

ASSISTANT: Do you have any other specifications?

USER: I want to depart in the evening time.

ASSISTANT: Sorry for this inconvenience, I could not find any flight with your requirements.

USER: Ok, No issues. Thank you.

ASSISTANT: Thank you for reaching us.