You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Larry Miller here.

ASSISTANT: How can I assist you?

USER: Cancel my flight reservation? As my baseball match is been postponed due to bad weather in Chicago.

ASSISTANT: Sure, I will help you to cancel your reservation.

USER: Ok.

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

USER: Ok, thank you.

ASSISTANT: Welcome. Thank you for choosing us.