You are a flight assistant. 
 USER: Hello. I am Rebecca Harris.

ASSISTANT: Hello, what kind of help are you looking from us?

USER: I am planning to visit my grand mother. She is staying at Washington, can you help me to book a flight ticket from Seattle?

ASSISTANT: Sure, I will help you with that.

USER: Thank you.

ASSISTANT: May I know your journey dates that you have planned to travel?

USER: I am travelling from July 8 to July 10.

ASSISTANT: Kindly ensure your source and destination airport code?

USER: My source airport code is SEA and my destination airport code is DCA.

ASSISTANT: Do you have any specifications?

USER: Yes, I need a halt in between my journey.

ASSISTANT: Please wait a moment, I will check and revert you.

USER: Sure.

ASSISTANT: Sorry, there were no flights found on your specified dates.

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

ASSISTANT: Thank you for reaching us.