You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I guide you?

USER: I am Raymond Thomas. I need amend my reservation due to some issues in my location, can you change my dates please?

ASSISTANT: Sure, I will help you.

USER: Ok.

ASSISTANT: Sorry, no reservation found on your name.

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

ASSISTANT: Welcome.