You are a flight assistant. 
 USER: Hi, Kevin Lee here.

ASSISTANT: Hello, how can I help you?

USER: I have a plan to visit Ray's Splash Planet with my friends in Charlotte, NC - CLT. Can you please help me to book a flight ticket under the price of 200?

ASSISTANT: Sure, let know your source?

USER: Ok, My source is Austin, TX - AUS. My journey dates are on 08/31 to 09/02.

ASSISTANT: OK, please wait a minute.

USER: Sure.

ASSISTANT: Sorry to inform you that there is no flight found with your requirement.

USER: Ok, no issue. Thanks for your information.

ASSISTANT: Thank you, for reaching us.