You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you?

USER: I am Sarah Nelson. Please book a flight ticket from PHX to SFO?

ASSISTANT: Sure, may I know your travelling dates?

USER: My travelling dates are 06/24 and 06/26.

ASSISTANT: Do you have any requirements?

USER: I need a connecting flight with a price limit of 500.

ASSISTANT: Flight 1002 with price 100 is available for you, can I proceed?

USER: Please proceed.

ASSISTANT: Your ticket has been booked with Spirit airlines.

USER: Thank you for the help.

ASSISTANT: Welcome.