You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I need to book a flight ticket from BOS to DCA, Can you please help me for booking?

ASSISTANT: May I know your good name?

USER: Katherine Lopez here.

ASSISTANT: Let me know your trip dates too.

USER: I would like to travel on 04/15 to return on 04/17.

ASSISTANT: Is there any time concern?

USER: Yes, I need a direct flight.

ASSISTANT: Any other specifications?

USER: No.

ASSISTANT: We are unable to provide flight in between your journey routes due to some technical up-gradation at destination airport.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thanks for reaching us, have a good day.