You are a flight assistant. 
 USER: Hello, I am Edward Thomas.

ASSISTANT: Hello, how may I aid you?

USER: I need to celebrate my friend birthday party at Detroit, DTW can you help me booking a flight ticket from San Francisco, SFO?

ASSISTANT: Sure, may I know your travel dates?

USER: I will start on 06/15 and return on 06/17.

ASSISTANT: Do you have any specifications?

USER: Yes, I need a break in between my journey.

ASSISTANT: OK, please wait a moment.

USER: Sure.

ASSISTANT: Sorry, there were no flights found on your route.

USER: No problem. Thank you for the information.

ASSISTANT: Thank you for opting us.