You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

USER: I am Patrick Hall and I want to meet my cousin who stay at Los angeles,CA-LAX from Dallas&Forth Worth, TX-DFW.

ASSISTANT: OK, I can help you in reserving the flight ticket for the same. But, for that I need to know your exact date of journey. Can you do that for me?

USER: Sure, my travelling dates are from  10 /18  to 10/20 and the price limit should be with in 500.

ASSISTANT: OK, sure. I have checked the airline database but, there was no flight available according to your credentials. Sorry for the inconvenience.

USER: OK, no issue.

ASSISTANT: Thank you for approaching to us. Have a good day.

USER: Thank you for your information.

ASSISTANT: My pleasure.