You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How exactly I can serve you the best today?

USER: I want to book a flight ticket from IAD to SEA. Can you please help me in that?

ASSISTANT: Sure, I am euphoric to help you with booking.

USER: Thank you.

ASSISTANT: Can you please forward your journey dates?

USER: My trip dates are May 14 to May 16.

ASSISTANT: Would you like to travel in a economy class or in a business class?

USER: I want to fly in business class.

ASSISTANT: Do you prefer any lay by in between journey?

USER: I need a connecting flight.

ASSISTANT: May I know your good name please?

USER: Myself Jessica Lewis.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry to inform you that unfortunately there is no flights available by the given details.

USER: Ok, no problem. Thank you.

ASSISTANT: Thanks for approaching us, wish you a good day.