You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: Can you please help me in booking my ticket from IAD to AUS?

ASSISTANT: Sure, when are you willing to travel?

USER: My travelling dates are from 06/29 to 07/01.

ASSISTANT: Do you have any preferences?

USER: Yes, I prefer business class with 1 connecting flight.

ASSISTANT: May I know your name please?

USER: Myself Thomas Miller. Also, make sure my return time will be in the evening.

ASSISTANT: Thank you for your details, we did not find any flights running in your desired routes.

USER: It's ok, thank you for your help.

ASSISTANT: Thank you for reaching us.