You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can we help you?

USER: Can you please help me in booking my flight ticket from PHX to LAS?

ASSISTANT: It's my pleasure to help you with your concern.

USER: Thank you.

ASSISTANT: Sure, can you please let me know your trip dates?

USER: My trip dates are from 03/20 to 03/22.

ASSISTANT: Are you comfortable with connecting flight or direct flight?

USER: I am comfortable with single connecting flight.

ASSISTANT: Would you like to fly with economy class flight or business class flight?

USER: I am ok with any of the class.

ASSISTANT: Do you have any specific time preference fr return and depart?

USER: My depart time will be in the evening.

ASSISTANT: May I know your airline preference?

USER: I am ok with any class.

ASSISTANT: Could you please help me with your name please, so I can proceed further?

USER: Myself Barbara Evans.

ASSISTANT: Thank you for sharing all the required intents that are required for your journey. Please allow me 2-3 minutes.

USER: Sure.

ASSISTANT: Thank you for waiting, Barbara Evans.

USER: Ok.

ASSISTANT: Sorry for the inconvenience, there is no evening flight available for the mentioned dates.

USER: It's ok, thank you for your help.

ASSISTANT: Thank you for reaching us!.