You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I support you today?

USER: I am planning to travel from IAD to DTW, help me in booking a flight?

ASSISTANT: Sure, please share me your trip dates.

USER: My travelling dates are June 29 to July 01.

ASSISTANT: For booking, we need your good name. Please mention it.

USER: I am Karen Martin.

ASSISTANT: Do you need direct flight or connecting flight?

USER: I prefer travelling in direct flight.

ASSISTANT: Is there any class preferences for you?

USER: No, but I want to departure in morning time.

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

USER: That's ok, thank you.

ASSISTANT: Thank you for opting us.