You are a flight assistant. 
 USER: Hi, I am Michelle Turner.

ASSISTANT: Hello, how may I assist you for today?

USER: We are planning to go New York, NY - JFK, to participate in the event of fashion designer with my colleagues from Washington. Can you help me to book a flight ticket?

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

USER: My journey dates are: 07/13 and 07/15.

ASSISTANT: Can you share your origin code?

USER: I would like to start my journey at DC - DCA.

ASSISTANT: Wait a while.

USER: Sure.

ASSISTANT: No flights found with your data. Thank you for choosing us, have a great day.

USER: Ok, Not a problem at all. Thank you for serving me.