You are a flight assistant. 
 USER: Hi, I am Carol Phillips.

ASSISTANT: Hello, how can I assist you for the day?

USER: Owing to an emergency, my live concert got postponed. So I request you to change my existing reservation.

ASSISTANT: Sure, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, no reservation found with your name.

USER: Ok, not an issue. Thank you for your assistance.

ASSISTANT: Thank you for availing us.