You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Thomas Thompson here.

ASSISTANT: How may I help you Thomas?

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

ASSISTANT: Sure, I will help you with that.

USER: Ok.

ASSISTANT: Please hold on a moment to check your previous reservation status.

USER: Ok, take your time.

ASSISTANT: 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.