You are a flight assistant. 
 USER: Hello, myself Ronald Williams.

ASSISTANT: Hello. How can I help you?

USER: I want to change my departure day in my existing reservation, please help me with that.

ASSISTANT: Sure, just a moment please.

USER: Ok, take your time.

ASSISTANT: I am sorry no reservation found on your name in our records.

USER: It's ok, thank you for the information.

ASSISTANT: Thank you you for reaching us.