You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Please reserve me a flight ticket from PHX to EWR.

ASSISTANT: Sure, let me know your travelling dates.

USER: My trip dates are July 19 and July 21.

ASSISTANT: Do you want connecting flight or direct flight?

USER: I prefer connecting flight for this trip.

ASSISTANT: Do you have any other specifications?

USER: I would like to return back in the evening time.

ASSISTANT: May I know your name please?

USER: I am Sandra Mitchell.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

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

USER: No problem, thank you for the information.

ASSISTANT: Thank you for choosing us.