You are a flight assistant. 
 USER: Hello, I am Mary Adams.

ASSISTANT: Hello,. How may I help you?

USER: I am planning to go for an holiday trip with my friend's Phoenix, can you please help me to book a flight ticket?

ASSISTANT: Sure. May I know your airport codes?

USER: My journey points are DEN to PHX.

ASSISTANT: Please provide me travelling dates.

USER: My journey dates are from 04/02 to 04/04.

ASSISTANT: Please provide your travelling dates.

USER: I already mentioned above.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Any specifications?

USER: I need a halt.

ASSISTANT: Ok. No flights found with your requirement.

USER: Ok, no issues, thanks for your information.

ASSISTANT: Thanks.