You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I be your helping hand today?

USER: Can you please check with the reservation on the name of Margaret Campbell? I just want to cancel my reservation, due to some problems.

ASSISTANT: Sure, we are mirthful to help you with cancellation. Please be on hold, I will check reservation on that name and let you know.

USER: Sure, I will wait.

ASSISTANT: Sorry to say that, there was no reservation found on that name.

USER: Thanks for your help.

ASSISTANT: Thank you for choosing our service.