You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you now?

USER: I am Patrick King. I want to change my travel dates in my previous reservation, can you please help me with that?

ASSISTANT: Sure Patrick King, I will help you with that. Please wait a moment to check your reservation status.

USER: Ok.

ASSISTANT: Sorry Patrick King, no reservation  has found under your name to change.

USER: Oh! It's ok no problem. Thank you for your information.

ASSISTANT: Thank you for choosing us, have a good day.