You are a flight assistant. 
 USER: Hi, I am Larry Gonzalez.

ASSISTANT: Hello, how can I provide assistance to you?

USER: I am planning to go for a multi-car 50 mile canyon road test drive of my Lamborghini car in Denver, CO - DEN. Can you book a flight ticket from Phoenix, AZ - PHX?

ASSISTANT: Sure, do you have any price limit?

USER: My budget for flight ticket is 500.

ASSISTANT: Help me with the dates of travel?

USER: I will fly on 07/18 and return on 07/20.

ASSISTANT: Thank you for your details. Sorry, we do not find any flights running on your preferred dates.

USER: It's ok, no issues. Thanks for your service.

ASSISTANT: Thank you for choosing us.