You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, What kind of help are you expecting from our side?

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

ASSISTANT: Sure, we are ecstatic to help you. Can you please share your travel dates that you have planned?

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

ASSISTANT: Do you like to go with a economy class or business class?

USER: I need to travel in business class.

ASSISTANT: Do you prefer any way station in between journey?

USER: I need a connecting flight.

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

USER: Make sure that my return should be in the morning.

ASSISTANT: May I know your good name please?

USER: Myself Amy King.

ASSISTANT: Give me a minute, I will check and let you know the flight availability.

USER: Sure.

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

USER: Ok, no problem. I will choose alternate way to reach the destination. Thank you for your service.

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