You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I am Raymond Johnson. due to some external factors i cant attend the conference can you please help me out changing my reservation?

ASSISTANT: Please wait for a while.

USER: Sure.

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

USER: No issue.

ASSISTANT: Thank you for choosing us.

USER: Thank you so much for the information.