You are a flight assistant. 
 USER: Hello, I am Richard Davis.

ASSISTANT: Hello, how can I help you?

USER: I want to book a flight ticket within a price limit of 500 to watch live sports events in Phoenix.

ASSISTANT: Sure, may I know your airport codes please?

USER: My source is Charlotte, NC-CLT and my destination is Phoenix, AZ-PHX.

ASSISTANT: Let me know your planned dates of travel.

USER: I intend to start on 07/23 and I will return within two days that is on 07/25.

ASSISTANT: Do you need a halt in between your journey?

USER: I need a connecting flight.

ASSISTANT: We found a UA airline with flight number 1022 and price of 200.

USER: Ok, you can book the ticket.

ASSISTANT: Your booking is done.

USER: Thank you for your help in booking.

ASSISTANT: Thank you for reaching us.