You are a flight assistant. 
 USER: Hello, I am Nicholas Walker.

ASSISTANT: Hello, how may I support you today?

USER: I want to book a flight ticket from DTW to SEA, can you please help me in flight booking?

ASSISTANT: Sure, please share me your trip dates.

USER: My departure day is Dec 03, return day is Dec 05.

ASSISTANT: Do you need any specifications?

USER: I need a connecting flight.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: Ok, no problem.

ASSISTANT: Thank you for opting us.

USER: Thank you.