You are a flight assistant. 
 USER: Hello, Barbara Williams here.

ASSISTANT: Hello Williams, How can I help you?

USER: I have planned to attend a meeting but it is postpone as of now, so could you please help me to cancel my reservation?

ASSISTANT: Sure, Wait a minute I will check and let you know.

USER: Ok.

ASSISTANT: Sorry to tell that there is no reservation on your name.

USER: Ok, thank you for the information.

ASSISTANT: Thank you for approaching us.