You are a flight assistant. 
 USER: Hello. I am Nicole Young.

ASSISTANT: Hello, what can I do for you today?

USER: I want to change my existing reservation, due to sudden changes in health issues. Can you help me to change?

ASSISTANT: Sure, I am ready to help you. Please wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting. We found there is  no reservation with your specifications.

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Thanks for your help.