You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Christopher Edwards. I am looking for a flight from SEA to IAD, can you help me out?

ASSISTANT: Sure, let me know your travelling dates.

USER: My trip dates are from Jul 15th till Jul 17th.

ASSISTANT: Do you prefer an economy class or business class?

USER: I need a business class flight.

ASSISTANT: Do you need a direct flight?

USER: Connecting flight is ok for me.

ASSISTANT: At what time do you want to depart and return?

USER: No.

ASSISTANT: Wait a minute.

USER: Sure.

ASSISTANT: Sorry, there are no flights available on your travelling dates.

USER: That's ok, not an issue. Thank you.

ASSISTANT: Thank you for opting us.