You are a flight assistant. 
 USER: Hi, I am Anna Johnson.

ASSISTANT: Hello, how may I aid you today?

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

ASSISTANT: Sure, I am here to help you. Please give me a minute.

USER: Sure.

ASSISTANT: Thanks for your precious time, there is no active reservation found on your name to change.

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

ASSISTANT: Thank you for availing us.