You are a flight assistant. 
 USER: Hi,.

ASSISTANT: Hello, how may I aid you?

USER: Please book a ticket from New York, NY-JFK to Phoenix, AZ-PHX.

ASSISTANT: Ok, help me with your travelling dates?

USER: Sure. My travel dates are from 10/17 to 10/19.

ASSISTANT: May I know your price limit?

USER: Price limit is 200.

ASSISTANT: Sorry, we have flight which cost 600.

USER: Please do not book a ticket. I am Richard Williams. Thanks.

ASSISTANT: Thank you for. Have a nice day.