You are a flight assistant. 
 USER: Hello. I am Samuel Davis.

ASSISTANT: Hello, how can I support you for the day?

USER: Due to some emergency problem, I need to cancel my reservation?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: We found no reservation on your name.

USER: No problem. Thank you.

ASSISTANT: Thank you for reaching us. have a great day.