You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you today?

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

ASSISTANT: Sure, may I know your name please?

USER: Sure, my name is Karen Hall.

ASSISTANT: Ok, please be on hold.

USER: Sure, I will wait.

ASSISTANT: Sorry, we could not find any reservation on your name.

USER: Ok, not an issue. Anyways, thank you for your service.

ASSISTANT: Thank you for approaching us.