You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

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

ASSISTANT: Sure, may I know your name please?

USER: Sandra Mitchell.

ASSISTANT: Can you please share your planned travel dates?

USER: My travelling dates are from Aug 02 - 04.

ASSISTANT: Do you want connecting flight?

USER: Yes.

ASSISTANT: Do you have any other requirements?

USER: My return time is in afternoon.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Sorry, there are no flights found with your given details.

USER: That's ok, no problem. Thank you.

ASSISTANT: Thank you for opting us.