You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Helen Smith here.

ASSISTANT: Ok, Helen how can I assist you?

USER: I would like to cancel my recent reservation which I have done it last week.

ASSISTANT: sure I will check it.

USER: Ok, take your time.

ASSISTANT: Sorry to say, no reservation found on your name.

USER: Oh its ok it might be done by my manger but he did not informed me yet.

ASSISTANT: Thank you for reaching us, have a nice day.

USER: Thank you for the information.