You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

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

ASSISTANT: Sure, I we are perky to help you.

USER: Thanks for considering my request.

ASSISTANT: Can you please share your good name with us?

USER: Margaret Lewis is my name.

ASSISTANT: Please be on hold.

USER: Sure.

ASSISTANT: There is no reservation found on your name in our database to change it.

USER: Ok, thanks for your information.

ASSISTANT: Thank you for availing us.