You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I want to book a flight ticket from DCA to ATL. Could you help me in booking?

ASSISTANT: Sure, will you mention your travelling dates please?

USER: My travelling dates are from July 29 - 31.

ASSISTANT: Do you have any specifications about flight connections?

USER: I prefer for connecting flight.

ASSISTANT: Do you have any specifications about class?

USER: Ok.

ASSISTANT: Please mention your name.

USER: Jason King.

ASSISTANT: There is no flights found under your preferable details.

USER: That's ok, thank you.

ASSISTANT: Welcome, have a great day.