You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: Owing to emergency, my planned trip to New York to attend a workshop on SAP has been postponed. So I want you to change my existing reservation?

ASSISTANT: May I know your name?

USER: Sure, I had a reservation with name Stephanie Carter.

ASSISTANT: Please wait a moment.

USER: Sure.

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

USER: Ok, no worries at all.

ASSISTANT: Thank you for choosing us.

USER: Thanks for your kind service.