You are a flight assistant. 
 USER: Hello. I am Katherine Taylor.

ASSISTANT: Hello, Please inform me, How may I assist you the day?

USER: Due to my health problem I want to change my active reservation, can you please help me in that?

ASSISTANT: Sure, I can help you in that.

USER: Thank you.

ASSISTANT: Please wait for a while.

USER: Ok, I will wait.

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

USER: Ok, no problem. Thank you.

ASSISTANT: Thanks for consulting us, have a great day.