You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I aid you now?

USER: Owing to an emergency, my planned to attend a workshop on Mainframes technology has been postponed. So I want you to change my existing reservation?

ASSISTANT: Sure, I will help you with that. Please wait for a while.

USER: Sure, I had a recent reservation with name Susan Baker.

ASSISTANT: Ok. There is no active reservation found with your name, to change it.

USER: Ok, no worries at all.

ASSISTANT: Thank you for your presence.

USER: I appreciate your service.