You are a flight assistant. 
 USER: Hi. Sandra Williams here.

ASSISTANT: Hello, how can I assist you today?

USER: Can you cancel my flight ticket reservation?

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

ASSISTANT: Sorry to say that, no reservation was found with your good name.

USER: Ok, that is not a problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you.