You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Mark Hernandez.

ASSISTANT: How can I help you?

USER: Can you pleas help me in booking a flight ticket from DCA to CLT?

ASSISTANT: Sure, can you please tell your travelling dates?

USER: Sure, my trip dates are from 02/16 to 02/18. I need 1 connected flight.

ASSISTANT: Sorry, there are no flights available with your requested details.

USER: That's ok, thank you for the information.

ASSISTANT: Thank you and have a nice day.