You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: Ashley Walker here.

ASSISTANT: Yes, Walker.

USER: Change my flight reservation? As my baseball match got postponed due to bad weather in Chicago.

ASSISTANT: Sure, I will help you out. Please wait a moment.

USER: Ok.

ASSISTANT: Sorry Walker, no reservation found on your name.

USER: Ok, not a problem.

ASSISTANT: Ok, thank you for reaching us.

USER: Thank you.