You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: Can you help me to reserve a flight ticket from DFW to IAD?

ASSISTANT: Sure, please share me your trip dates.

USER: My travelling dates are 25 to 27 of June.

ASSISTANT: Do you need direct flight or connecting flight?

USER: I am looking for a connecting flight.

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

USER: I am Jennifer Lee.

ASSISTANT: May I know your class preferences?

USER: I am ok with any class.

ASSISTANT: We found a Hawaiian airline and 1021 is flight number with a fare of 200. Shall I proceed?

USER: If it is return in the morning, please proceed to booking.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

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

USER: It's ok, not a problem, thank you.

ASSISTANT: Thank you for supporting us.