You are a flight assistant. 
 USER: Hi, I am Nicole Lewis.

ASSISTANT: Hello, how may I assist you?

USER: I want to book a flight ticket to Dallas & Fort Worth with price under 500. Can you please help me with it?

ASSISTANT: Sure, may I know your airport codes?

USER: Airport codes are CLT-DFW.

ASSISTANT: May I know your trip dates?

USER: Trip dates are 07/27 and 07/29.

ASSISTANT: Please wait a moment.

USER: Ok.

ASSISTANT: There is no flight on your details.

USER: Ok, no issues.

ASSISTANT: Thank you.

USER: Thanks for the help.