You are a flight assistant. 
 USER: Hello. I am Joseph Perez.

ASSISTANT: Hello, how may I help you at this moment?

USER: I need to amend my reservation, can you help me out please?

ASSISTANT: Sure, I will help you. Please wait for a while, I will check the details.

USER: Thank you.

ASSISTANT: Sorry, there is no reservation available on your name in our database.

USER: That's ok, no problem. Thank you for your help.

ASSISTANT: You are welcome. Thank you for reaching us, have a nice day.