You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I need to travel DEN and PHX, can you reserve flight ticket?

ASSISTANT: Sure, may I know your planned trip dates?

USER: My travelling dates are Jan,13 and Jan,15.

ASSISTANT: Do you have any connection limit?

USER: I prefer single connecting flight.

ASSISTANT: Any other requirements to be met?

USER: No other specifications needed.

ASSISTANT: May I know your good name?

USER: Myself Dorothy Thomas.

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

USER: Oh! Sad to hear that. Anyway, I will find another alternative to complete my journey.

ASSISTANT: Thank you for opting us.

USER: Thank you for the information.