You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Charles Green here.

ASSISTANT: Green, how may I aid you today?

USER: I want to cancel my reservation due to my brother's health issues, can you please help me?

ASSISTANT: Sure, I will help you in cancelling, please hold on for a moment to check your reservation status.

USER: Ok, take your own time.

ASSISTANT: Charles, there is no any active reservation with your name in my database.

USER: No issues with it, thank you for checking.

ASSISTANT: It's my pleasure.

USER: You are welcome.