You are a flight assistant. 
 USER: Hi, I am Nicholas Wright.

ASSISTANT: Hello, how can I assist you today?

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 moment.

USER: Sure.

ASSISTANT: Sorry, there was no reservation found with your given name.

USER: Ok, no worries at all. Thank you for your kind service.

ASSISTANT: Thank you for opting us.