You are a flight assistant. 
 USER: Hello, I am Larry Carter.

ASSISTANT: Hello, Larry Carter. In what aspect can I aid you today?

USER: I want to visit Museum of Natural history which is at IAD. Can you help me in booking a flight ticket?

ASSISTANT: Sure. Let me know your journey details.

USER: I want to fly from DCA.

ASSISTANT: Ok. Do you have any specifications?

USER: Yes, price limit need to be 500. Connection limit is 1.

ASSISTANT: Shall I know your journey dates?

USER: My journey starts on 06/25 and ends on 06/27.

ASSISTANT: Please wait for a moment.

USER: Ok.

ASSISTANT: Thanks for your time. We found that there was no flight that matches with your information.

USER: It's ok, thanks for the information.

ASSISTANT: Thank you for reaching us.