You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, can you please tell me how can I assist you?

USER: I am David Smith, I am unable to travel right now due to health issues, so can you help me for cancelling my recent reservation?

ASSISTANT: Sorry Smith, no reservation found on your name in my database.

USER: Oh! It's ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: My pleasure, have a nice day.