You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I want to change my reservation which is done recently due to some health issues, can you please help me out?

ASSISTANT: Sure, please wait for a while.

USER: Ok, I will wait.

ASSISTANT: Can I know your name please?

USER: Sure, my name is Brandon Jones.

ASSISTANT: Sorry Jones, there is no active reservation found with your name in our records.

USER: Ok, no problem. Thank you for your service.

ASSISTANT: Most welcome.