You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I want to book a flight ticket from DTW to SFO. Could you help me in booking?

ASSISTANT: Sure, may I know your planned travel dates?

USER: My travelling dates are from Dec 05 - 07.

ASSISTANT: Do you have any limits on number of connections?

USER: I prefer for connecting flight.

ASSISTANT: May I know your name for the booking process?

USER: Margaret Collins.

ASSISTANT: Sorry, no flights are available on your required dates.

USER: That's ok, thank you.

ASSISTANT: Welcome, thank you for reaching us.