You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I am Joseph Clark. Please help me in changing my recent reservation.

ASSISTANT: Sure, please allow me a moment.

USER: Sure.

ASSISTANT: Thank you for waiting.

USER: Ok.

ASSISTANT: Here, there is no active reservation have been found under your name in our database to amend it.

USER: It's ok, thank you for checking.

ASSISTANT: Thank you for reaching us.