You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Charles Wilson here.

ASSISTANT: Charles Wilson, how may I aid you?

USER: Due to inconvenience of my work, I want to cancel my reservation. Can you please help me for that?

ASSISTANT: Sure, please give me a moment to check your ticket status.

USER: Ok, I will wait.

ASSISTANT: No reservation is available by your name.

USER: Anyway, thanks for the information.