You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello. How may I assist you today?

USER: I am Stephanie Baker . Book a flight ticket from JFA to DCA.

ASSISTANT: Thank you for saying your name. OK Stephanie, can you please, tell me the travel dates?

USER: My travelling dates are 12/11 to 12/13.

ASSISTANT: OK, wait a moment meanwhile I'll check the details of the flight.

USER: OK. Book a flight ticket from JFK to DCA.

ASSISTANT: OK. Sorry Stephanie, I cannot find any flight with your details.

USER: Ok. Thank you.

ASSISTANT: Thank you, have a great day!.