You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I want to travel from DTW to SFO. Can you help me to book a flight ticket?

ASSISTANT: Sure, may I know your travel dates?

USER: I want to travel in the flight on May 21 and May 23.

ASSISTANT: Do you need any way station in your journey?

USER: I want to travel in a connecting flight.

ASSISTANT: Is there any specific time to travel?

USER: I want to depart in afternoon time.

ASSISTANT: Do you have any other requirements?

USER: No.

ASSISTANT: May I know your name please?

USER: Jessica Mitchell.

ASSISTANT: Sorry to inform you that, there are no flights available with your specifications.

USER: That's ok. Anyways, thank you.

ASSISTANT: Thank you for opting us.