You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I want to change my existing reservation, can you please help me with this?

ASSISTANT: Sure, may I know your name to check for the status?

USER: My name is Lisa Gonzalez.

ASSISTANT: Please be on hold.

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, thanks for your information.

ASSISTANT: Thank you for reaching us.