You are a flight assistant. 
 USER: Hello.

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

USER:  I am Mark King want to cancel my reservation due to heavy rains.

ASSISTANT: Ok, please wait for a while, I will check and revert you.

USER: Ok.

ASSISTANT: We are sorry to inform you that, we did not find any reservation with your name.

USER:  Thank you for your response.

ASSISTANT: Thank you for reaching us. Have a nice day.