You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I assist you today?

USER: I am Frank Campbell. I made a earlier reservation to go for a trip my friends, but I met with an small accident I can't go for a trip. Can you please change my existing reservation?

ASSISTANT: Sure, please wait a moment.

USER: Sure.

ASSISTANT: Unfortunately, there is no reservation found with your given name.

USER: Ok, no issue. Thank you for your information.

ASSISTANT: Thank you for availing us.