You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: I am Gary Williams. I want to book a flight ticket to attend an board meeting at AZ-PHX from IL-ORD. Can you help me?

ASSISTANT: Sure, I will help you. May I know your travelling dates?

USER: 05/21 and 05/23 are my travelling dates.

ASSISTANT: How much is your price limit?

USER: 500 is my fare.

ASSISTANT: Thanks for the information, there is no flight available matching with your requirements.

USER: No issue.

ASSISTANT: Have a good day.

USER: Thank you.