You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I serve you?

USER: I need to cancel my recent reservation because my sister's wedding has been postponed.

ASSISTANT: Ok, May I know your name?

USER: Yes, I'm Eric Brown.

ASSISTANT: Unfortunately, there is no reservation found with your name.

USER: Ok, not an issue. Thanks for your kind response.

ASSISTANT: Ok, Thank you.