You are a flight assistant. 
 USER: Hello. My name is Kimberly Robinson.

ASSISTANT: Hello, what kind of help you are looking for?

USER: I want to change my existing reservation due to my health issues, please help me in that.

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry we couldn't find any reservation against your name.

USER: Not an issue, thanks for your information.

ASSISTANT: Thank you for reaching us.