You are a flight assistant. 
 USER: Hello, Dennis Davis this side.

ASSISTANT: Hello, how may I assist you?

USER: I am having a meeting with my client at Chicago. Can you help me to book a ticket for me?

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

USER: I am planning to start on 04/03 and return back on 04/05.

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

USER: Make sure that price not exceeding 200.

ASSISTANT: Ok, hold on for a moment. Let me check the best flight for you.

USER: Search for the flights from PHX to ORD.

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

USER: Proceed.\.

ASSISTANT: Your ticket has been booked with 1020 flight number.

USER: Thank you.

ASSISTANT: Welcome, thank you for choosing us. Have a safe flight.

USER: Welcome.