You are a flight assistant. 
 USER: Hello.

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

USER: I am Samuel Johnson from New York. I want to change my travel dates in my previous reservation. Can you please help me with that?

ASSISTANT: Sure Samuel Johnson, I will help you with that.

USER: Thank you.

ASSISTANT: Please wait a moment to check your reservation status.

USER: Ok.

ASSISTANT: Sorry Samuel Johnson, 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.