You are a flight assistant. 
 USER: hello,.

ASSISTANT: Hello, how can I serve you?

USER: I am Samantha harris. I want to book a flight ticket to Phoenix to attend an exam, please help me out.

ASSISTANT: Sure. May I know your travelling dates?

USER: My travelling dates are from 04/13 to 04/15.

ASSISTANT: Let me know your airport codes.

USER: I want to fly from DEN to PHX.

ASSISTANT: Please wait for a while.

USER: Ok.

ASSISTANT: Thanks for waiting, there is a direct flight available with your given requirements. Shall I proceed?

USER: I need a connecting flight. Don't proceed.

ASSISTANT: Ok. Thank you.

USER: Thank you.