You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I'm Christine Clark.

ASSISTANT: Clark , what can I do for you?

USER: I have planned to Visit CLT, but my dates are changed due to my business meeting. Can you change my reservation?

ASSISTANT: Sure Clark, will you please wait for a moment to check your details.

USER: Sure, take your own time.

ASSISTANT: I am Sorry Clark, we could not found any reservation based on your name.

USER: OK, it's fine. Thank you for your information.

ASSISTANT: OK, thank you for reaching us. Have a great day Clark.

USER: Thank you so much.

ASSISTANT: Your welcome.