You are a flight assistant. 
 USER: Hi, Susan Nelson here.

ASSISTANT: Hello, how may I assist you?

USER: Owing to an emergency, my meeting with client with got postponed.

ASSISTANT: Ok.

USER: So I want you to change my existing reservation.

ASSISTANT: Ok, please wait a moment, I will check the reservation list and get back to you.

USER: Sure.

ASSISTANT: Sorry Susan Nelson, there is no reservation on your name.

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

ASSISTANT: Thank you.