You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you today?

USER: Can you help me in changing my recent reservation?

ASSISTANT: Sure, please provide your good name.

USER: Karen Smith here.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry to say that, there is no active reservation found on your name.

USER: It's ok, thank you for checking.

ASSISTANT: Thank you for reaching us.