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

ASSISTANT: Hello.

USER: As I am suffering from severe fever I cant attend for the business meeting. Could you please help me in changing my existing reservation?

ASSISTANT: Sure, please wait a moment I will check and get back to you.

USER: Sure.

ASSISTANT: Thanks for waiting, there are no reservation found against your name.

USER: No issues, Thank you for the information.

ASSISTANT: Thanks for approaching us, have a nice day.