You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: Can you  please book a flight ticket from DTW to SFO?

ASSISTANT: Sure, can you please share your journey dates?

USER: Thank you. I have planned my travel  dates as June 04 and June 06.

ASSISTANT: Are you looking for any preferred connections?

USER: I am looking for single connecting flight.

ASSISTANT: Do you have any other specifications to be met?

USER: I would  prefer normal cost airlines only.

ASSISTANT: Can I have your name to proceed?

USER: Sure, myself Larry Williams.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Thank you for your valuable time, unfortunately no flights available on that route.

USER: Oh! It is sad to hear. Anyway, thank you for your time.

ASSISTANT: Thank you for reaching us.

USER: Most welcome.