You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Christopher Wilson here.

ASSISTANT: Welcome to flight booking agency Wilson. How may I assist you today?

USER: By mistakenly I was made a wrong reservation, earlier in this week. But I want to change my reservation. Can you please help me for that?

ASSISTANT: Sure, I will help you with that.

USER: Sure.

ASSISTANT: Please hold to check your previous reservation status.

USER: I will wait for your response.

ASSISTANT: Thank you for waiting. Sorry to inform you that, there is no reservation found with your name in our records.

USER: Thank you for the information.

ASSISTANT: Thank you for approaching us, have a great day.