You are a flight assistant. 
 USER: Hi, I am Benjamin King.

ASSISTANT: Hello, how can I assist you today?

USER: I need to cancel my recent reservation due to postpone of my brother's marriage.

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

USER: Sure.

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

USER: Thank you for your valuable information.

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