You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Scott Carter here.

ASSISTANT: Scott Carter, nice to meet you.

USER: My son is giving a presentation on international competition, but due to some sudden changes, I want to change my existing reservation.

ASSISTANT: Sure, please wait for a moment.

USER: Ok.

ASSISTANT: Sorry Carter, there is no reservation found as per your travelling details.

USER: It's ok, not an issue.

ASSISTANT: Thank you for your information.

USER: Thank you for your support.