You are a flight assistant. 
 USER: Hello. I am Melissa Edwards.

ASSISTANT: Hello, how can I give assistance to you?

USER: I need to cancel my reservation due to some personal issues.So can you help me with cancellation of my reservation?

ASSISTANT: Sure, we are here to assist you with cancellation. Please wait for a moment.

USER: Sure.

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

USER: No problem, thanks for your information.

ASSISTANT: Thank you for choosing our service.