You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you today?

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

ASSISTANT: Sure, may I know your name?

USER: Sure, Matthew Clark here.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Sorry, there are no active reservations on your given name to change.

USER: Ok, no issues. Thank you for your assistance.

ASSISTANT: Thank you for reaching our service.