You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you at present?

USER: Can you please help me to change my reservation on the name of Kevin Johnson?

ASSISTANT: Sure, please wait for a couple of minutes.

USER: Sure.

ASSISTANT: Thanks for waiting, there was no reservation found on your name to change it.

USER: Not a problem, thank you.

ASSISTANT: Thank you for reaching our service.