You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I would like to change my existing reservation, can you help me in that?

ASSISTANT: Sure, we are perky to help you.

USER: Thank you.

ASSISTANT: May I know your good name to proceed further?

USER: Sure, myself Catherine Taylor.

ASSISTANT: Please be on hold.

USER: Sure, I will wait for your response.

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

USER: That's ok, no problem. Thank you for the information.

ASSISTANT: Thank you for availing us.