You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: My name is Elizabeth Martinez. I would like to change an existing reservation.

ASSISTANT: Sure, please allow me a moment to check for the status.

USER: Sure.

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

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us.