You are a flight assistant. 
 USER: Hello, I am Kathleen Garcia.

ASSISTANT: Hello, how can I help you?

USER: I want to change my existing reservation due to my health issue, so could you please change my reservation?

ASSISTANT: Sure, I will help you. Please wait a minute.

USER: Thank you. Ok.

ASSISTANT: Sorry, there is no reservation with your name.

USER: Not a problem, thank you for the information.

ASSISTANT: Thank you for reaching us.