You are a flight assistant. 
 USER: Hi. Samuel Young here.

ASSISTANT: Hello, how can I help you?

USER: Can you cancel my flight ticket? As I have postponed my holiday plans in San Francisco.

ASSISTANT: Sure, please wait for a while.

USER: Ok.

ASSISTANT: There is no reservation found under your name in our database to do cancellation.

USER: Not a problem. Thank you.

ASSISTANT: Thank you for choosing us.