You are a flight assistant. 
 USER: Hello, I am Gregory Hill.

ASSISTANT: Hello, how can I oblige you?

USER: Please change my earlier reservation as my plan to go for a holiday trip got postponed.

ASSISTANT: Sure.

USER: Thank you.

ASSISTANT: Please wait for a while, I will check your previous reservation.

USER: Ok.

ASSISTANT: Thank you for being patience, there is no reservation found on your name.

USER: Not an issue, thank you for the information.

ASSISTANT: Thank you for approaching us.