You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Sandra Thomas here.

ASSISTANT: How can I help you?

USER: I have some urgent work in my office. So, I am unable to catch my flight. Can you cancel my ticket?

ASSISTANT: Sure, please wait for a while.

USER: Thanks.

ASSISTANT: Sorry, there is no reservation found by your name.

USER: That's fine. Thank you for checking.

ASSISTANT: Thank you  and have a nice day.