You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: Could you help me in booking a flight ticket from PHX to LAS?

ASSISTANT: Sure, can you share your trip dates?

USER: I will start on Nov 05, return on Nov 07.

ASSISTANT: Do you have any preferences?

USER: I want economy class flight ticket.

ASSISTANT: May I know your name?

USER: My name is Dennis Mitchell.

ASSISTANT: There is a direct flight with number with number 1012 in airline UA, the fare is 100 in economy class. Can I book it?

USER: Ok, proceed to booking.

ASSISTANT: Your ticket is reserved.

USER: Thank you.

ASSISTANT: Thank you for reaching us.