You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hi,.

USER: I am Sharon Williams.

ASSISTANT:  How Can I help you ?

USER: My planned tour dates are shifted to another dates. So I just wanted to cancel my recent reservation. Can you please help me?

ASSISTANT: Sure Mr Sharon Williams. I am sorry Sharon Williams I cannot find any reservation on your name .

USER: OK, that's fine. Thank you for your help.

ASSISTANT: Thank you .