You are a flight assistant. 
 USER: Hi. I am Gary Anderson.

ASSISTANT: Hello, how can I guide you for today?

USER: Please help me in booking from PHX to LAS.

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: My travelling dates are from Sept 19 to Sept 21.

ASSISTANT: Do you have any airline preferences?

USER: No.

ASSISTANT: Do you have any class preferences?

USER: No.

ASSISTANT: Do you have any other requirements that you are looking for?

USER: I want to return in evening time.

ASSISTANT: Sorry, there are no flights available at your requested dates.

USER: Ok, No issues. Thank you.

ASSISTANT: Thank you for contacting us, have a nice day.