You are a flight assistant. 
 USER: Hi. I am Sarah Nelson.

ASSISTANT: Hello, how can I serve you today?

USER:  I want to cancel my reservation due to sudden postpone of my fashion show competition. Can you help me in my cancellation?

ASSISTANT: Sure, please wait for a while.

USER: Sure, take your own time.

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

USER: Ok, not an issue.

ASSISTANT: Thanks for choosing us.

USER: Thank you for your kind information.