You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, may I know how best I can help you today?

USER: I am Alexander Perez.

ASSISTANT: OK.

USER: As I am planning to give party to my friends, Can you please book a ticket on 11/18?

ASSISTANT: Ok, to where do I need to book your ticket?

USER: As it a round trip and my airport code is Phoenix, PHX.

ASSISTANT: Ok good, how many halt do you need?

USER: I need direct flight.

ASSISTANT: Very happy to tell you that Spirit airline is available on your route, they are charging just 100 only. Are you okay with this airline?

USER: Is it a direct flight.

ASSISTANT: Yes, It is a direct flight.

USER: You can proceed.

ASSISTANT: Ok, your ticket has been booked successfully with flight 1023.

USER: Thank you.

ASSISTANT: Thanks for making us to serve you as you requested.