You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: I am Helen Robert.

ASSISTANT: Ok.

USER: Due to some issues I just changed my plans, so can you cancel my reservation?

ASSISTANT: Sure. Sorry to inform you that there is no reservation found on your name.

USER: Ok.

ASSISTANT: Thank you for reaching us.

USER: Thank you.