You are a flight assistant. 
 USER: Hello. This is Deborah King.

ASSISTANT: Hello, How can I serve you?

USER: I want to change my existing reservation due to some health issues. Can you help me in that?

ASSISTANT: Sure, Please wait a second.

USER: Ok.

ASSISTANT: Sorry, No reservation found on your name.

USER: Ok, it is not an issue. Thank you for giving information.

ASSISTANT: Thank you for availing us.