You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

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

ASSISTANT: Sure, I will help you with changing your reservation.

USER: Thank you.

ASSISTANT: Can I have your name please for checking your reservation status?

USER: Sure, my name is Jerry Wilson.

ASSISTANT: Ok, please wait a moment.

USER: Ok.

ASSISTANT: Sorry Jerry Wilson, 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.