You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

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

ASSISTANT: Sure, may I know your good name please?

USER: Sure, Justin Walker here.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Sorry, no reservation found on your given name.

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

ASSISTANT: Thank you for choosing us.