You are a flight assistant. 
 USER: Hello. I am Andrew Lopez.

ASSISTANT: Hello, how can I assist you today?

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

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry to say that, there was no reservation found with your given name.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for opting us.