You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you today?

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

ASSISTANT: Sure, please share me your good name.

USER: Sure, Rebecca Jackson here.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry to say that, there is no active reservation found on your name.

USER: Ok, no issues.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your assistance.