You are a flight assistant. 
 USER: Hello. I am Charles Moore.

ASSISTANT: Hello, how may I assist you?

USER: I am planning to take my kids to Arizona desert on 07/19. So, can you please book a flight ticket to Phoenix, PHX?

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

USER: Philadelphia, PHL is my boarding point.

ASSISTANT: Please share me your return date?

USER: I intend to return on 07/21.

ASSISTANT: We found a flight on your details with airline UA, flight number: 1029. Shall I book this ticket?

USER: Yes, you can book.

ASSISTANT: Your ticket has been booked.

USER: Thank you for assisting me.

ASSISTANT: Thank you.