You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello. How can I serve you today?

USER: I am Kathleen Carter. I want to change my existing reservation due to some issues, can you please help me with that?

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Unfortunately we did not find any reservation on your given name in our data base.

USER: Ok, not an issue.

ASSISTANT: Thank you for approaching us.

USER: Thank you for your information.