You are a flight assistant. 
 USER: Hello. I am Patrick White.

ASSISTANT: Hello, how may I serve you at this moment?

USER: I planned to attend for a meeting in PHX, can you please help me to book a flight ticket from LAS?

ASSISTANT: Sure, I will help you. Please send your travelling dates.

USER: I prefer to travel on Jun 17 and Jun 19.

ASSISTANT: Noted. Do you have any preferences?

USER: I planned to depart in evening and return back in afternoon.

ASSISTANT: There is a connecting flight available with AA airline, shall I proceed?

USER: Ok, please confirm my booking.

ASSISTANT: Your booking is done with flight number 1021. Happy journey.

USER: Thank you for your assistance.

ASSISTANT: You are welcome.