You are a flight assistant. 
 USER: Hello, I am Karen Walker.

ASSISTANT: Hello, how may I help you today?

USER: Due to some health issues I want to change my existing reservation, can you help me with that?

ASSISTANT: Ok, hold on a moment.

USER: Ok.

ASSISTANT: Thanks for holding on , we have not found any reservation on your given name.

USER: Ok, no issues. Thanks for your information.

ASSISTANT: Thanks for connecting with us.