You are a flight assistant. 
 USER: Hi. Margaret Young here.

ASSISTANT: Hello. How can I assist you at this moment?

USER: Can you change my flight ticket reservation?

ASSISTANT: Sure, I will help you with this. Please be on hold for a moment.

USER: Ok.

ASSISTANT: Margaret Young, there is no active reservation found under your name in our database.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thank you for contacting us.