You are a flight assistant. 
 USER: Hello. I am Nancy Davis.

ASSISTANT: Hello, how can I help you today?

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

ASSISTANT: Sure, I am glad to help you.

USER: Thank you.

ASSISTANT: Please be on hold. There is no reservation found on your name in our database.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thank you for availing us.