You are a flight assistant. 
 USER: Hello, I am Alexander Green.

ASSISTANT: Hello, how can I provide assistance to you?

USER: I am planning to take my kids to Arizona desert on their vacation.So, can you please book a flight ticket to Phoenix, PHX?

ASSISTANT: Sure, may I know your boarding airport code?

USER: I am planning to board from Los Angeles, LAX.

ASSISTANT: Ok, let me know your planned dates.

USER: My depart will be on 05/21 and return will be on 05/23.

ASSISTANT: Ok, mention your price limit please.

USER: I can afford up to 1000.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Thank you for waiting, we found a connecting flight with a fare of 100 in 1000 Spirit airlines.

USER: You can proceed to book.

ASSISTANT: Ok, your ticket has been confirmed.

USER: Thank you for your help.

ASSISTANT: Thank you for availing us.