You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I am Rachel Evans, want to book a flight ticket to Seattle with price under 500. Can you help me with it?

ASSISTANT: Sure, please share me your travel dates.

USER: My travel dates are 05/30 and 06/01.

ASSISTANT: Let me know your airport codes.

USER: Airport codes are CLT-SEA.

ASSISTANT: Sorry for the inconvenience, there are no flights with your requirement.

USER: Ok, no issues.

ASSISTANT: Have a nice day.