You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: Can you please help me to change my existing reservation?

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

USER: Justine Nelson here.

ASSISTANT: Please be on hold, I will get back to you in a minute.

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: Ok, not an issue. Thank you for checking.

ASSISTANT: Thank you for reaching us.