You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you?

USER: Owing to an emergency, my business conference got postponed. So I request you to change my existing reservation.

ASSISTANT: Sure, may I know your name to check the reservation list and get back to you?

USER: Sure. Stephen Taylor here.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: We could not find any reservation by the name you provided.

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

ASSISTANT: Thank you for choosing us.