You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: My name is Ronald Hill. As my business trip got postponed, I want to change my reservation. Can you please help me with that?

ASSISTANT: Sure, please wait.

USER: Ok.

ASSISTANT: Sorry. There is no reservation on your name.

USER: That's ok. Thank you for your time.

ASSISTANT: Welcome.