You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Nancy Parker here, I am planning for an outing at Chicago. Can you help me to book a ticket?

ASSISTANT: Sure, may I know your travel dates please?

USER: I am planning my journey on 07/31 and 08/02.

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

USER: Search for the flights from PHX to ORD.

ASSISTANT: Ok, hold on for a moment.

USER: Ensure that it's price is within 500.

ASSISTANT: Shall I proceed? I found a flight for you with Frontier airline and it costs you 100.

USER: Please book 1 ticket for me.

ASSISTANT: Your ticket has been booked with 1000 flight number.

USER: Thank you for booking.

ASSISTANT: Thank you for choosing us. have a safe flight.

USER: You are welcome.