You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am Patricia Hill. 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: Ok, please wait a moment let me check your reservation status.

USER: Sure.

ASSISTANT: Sorry to inform you, there is no reservation found on your name to change it.

USER: Ok, thank you for providing information.

ASSISTANT: Welcome Patricia Hill.