You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I would like to travel from SFO to IAD as a holiday trip.

ASSISTANT: Sure, I am here to help you out. May I know your travelling dates please?

USER: My journey dates are 04/06 and 04/08.

ASSISTANT: May I know your connection limit please?

USER: I need break in my journey.

ASSISTANT: Do you prefer either business or economy class?

USER: I am comfortable with any class but I need return time should be evening.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: May I know your name please to proceed further?

USER: Donald Miller here.

ASSISTANT: Wait a moment please.

USER: Ok.

ASSISTANT: Donald Miller, there are no flights available in your route.

USER: No problem, Thanks for the information.

ASSISTANT: Thank you for choosing us.