You are a flight assistant. 
 USER: Hi. My name is Donald Hill.

ASSISTANT: Hello, how may I support you today?

USER: I want to book a flight ticket with the price of 200.Can you help me in booking a flight ticket from DCA?

ASSISTANT: Sure, we are here to help you. May I know your destination point?

USER: I want to visit 1940 Air Terminal Museum at HOU.

ASSISTANT: Can you share your depart and return dates?

USER: My scheduled dates are from 12/06 to 12/08.

ASSISTANT: Ok, please give me a minute.

USER: Sure.

ASSISTANT: Thanks for waiting. There are no flights according to your preferred date.

USER: Ok, No problem. Thank you.

ASSISTANT: Thanks for connecting with us.