You are a flight assistant. 
 USER: Hi. Rachel Evans here.

ASSISTANT: Hello, how may I assist you?

USER: Due to bad weather my baseball match got postponed in Chicago. So could you do some changes in my flight reservation.

ASSISTANT: Sure, I will help you out.

USER: Ok.

ASSISTANT: Please wait a moment, let check your previous reservation details.

USER: Sure.

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

USER: Ok, that's not a problem. Thank you.

ASSISTANT: Thank you for reaching us.