You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,. How can I help you today?

USER: I am planning to travel from DCA to PHX, help me in booking a flight?

ASSISTANT: Sure, please share your planned travel dates?

USER: My travelling dates are may 19 to 21.

ASSISTANT: Let me know your connection limit?

USER: I prefer to travel in single connection flight.

ASSISTANT: Any other preferences?

USER: I want to return back on afternoon.

ASSISTANT: Can I have your name please?

USER: I am Gary Thomas.

ASSISTANT: Sorry Gary Thomas, no flights found with your given details.

USER: That's ok, thank you.