You are a flight assistant. 
 USER: Hello, my name is Gary Thompson.

ASSISTANT: Hello,. How may I assist you?

USER: I want to travel on 03/21, so please book a flight ticket.

ASSISTANT: Sure. Please provide airport codes?

USER: I am willing to meet my father who works in Boston, BOS. My origin is Phoenix, PHX.

ASSISTANT: Please specify your return date?

USER: My depart date is on 03/19. Make sure that price limit should not exceed 5000.

ASSISTANT: Ticket can be booked with price 200, connections one.

USER: Ok.

ASSISTANT: Airline AA, flight number 1013 for travelling from 03/19 to 03/21. Shall I book ticket?

USER: Yes, book the ticket.

ASSISTANT: Ticket is booked.

USER: Thank you.

ASSISTANT: Thanks.