You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: As my educational trip was postponed, I want to change my existing reservation.

ASSISTANT: Sure, please wait a minute.

USER: Ok.

ASSISTANT: Sorry, to inform you that there is no reservation found. Please provide me your good name to continue further details.

USER: Ok, I am Jennifer Smith.

ASSISTANT: Thank you, for reaching us.

USER: Thank you for your assistance.