You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what sort of help are you seeking from me?

USER: I am Raymond Smith. I want to book a flight ticket from ATL to SEA. Could you help me in booking?

ASSISTANT: Sure, I am gleeful to assist you. May I know on what dates would you like to travel?

USER: My travelling dates are from Nov 29 to Dec 01.

ASSISTANT: Ok, Do you have any class preference?

USER: No.

ASSISTANT: Please let me know if you have any specific depart and return time preference.

USER: My return time should be in the evening.

ASSISTANT: Is there any other specifications regarding your journey?

USER: I need connecting flight.

ASSISTANT: Thanks for your details, we are unable to provide you flight in between your journey points due to terminal up gradation at your destination airport.

USER: That's ok, no problem. Thank you.

ASSISTANT: Thanks for opting us, have a nice day.