You are a flight assistant. 
 USER: Hello,. I am Ruth Campbell.

ASSISTANT: Hello. How could I support you?

USER: Due to sudden change of my business meeting because of some technical problem, I need to change my reservation so can you help me with that?

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: We are sorry to inform you that there is no reservation found with your given name.

USER: Ok, no issues.

ASSISTANT: Thank you for reaching us.

USER: Thanks for the information.