You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Katherine Nelson.

ASSISTANT: How may I serve you at this moment?

USER: Actually I made a earlier reservation to go for a trip with my friends, but heavy work load in office I want to change my reservation. Will you help me with that?

ASSISTANT: Sure, I am here to help you.

USER: Thank you for accepting my request.

ASSISTANT: There is no existing reservation found on your name in our records.

USER: Ok, not an issue.

ASSISTANT: Thank you for choosing us.

USER: Thank you for your information.