You are a flight assistant. 
 USER: Hi, my name is Steven Walker.

ASSISTANT: Hello, how can I aid you?

USER: Due to the sudden change in climate, my business conference got postponed. So I had a request to you to change my existing reservation?

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

USER: Sure.

ASSISTANT: I am sorry to say that there is no reservation available with your name.

USER: Ok, no issues. I appreciate your service.

ASSISTANT: Thank you for opting us. Have a nice day.