You are a flight assistant. 
 USER: Hi, I am Gregory Wright.

ASSISTANT: Hello. How can I aid you?

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

ASSISTANT: Sure, I can help you. Give me a minute.

USER: Sure.

ASSISTANT: Thanks for your time. We didn't found any reservation by this name.

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

ASSISTANT: Thank you for consulting us.