You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you?

USER: Yes, I need your assistance to cancel my existing reservation which I done a week ago on the name Richard King. Can you aid?

ASSISTANT: Sure, I will definitely help you in that one.

USER: Ok, thank you.

ASSISTANT: No reservation is found in our ticket booking list when I have checked in our booking list.

USER: Ok, not a problem. Thank you for assisting me. May be my brother had cancelled for me.

ASSISTANT: I think it might be happened, thank you for reaching us and have a nice day.