You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I'm Richard Lewis, want to change my reservation dates. Can you help me in this?

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, there is no reservation found with your name in our records.

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

ASSISTANT: Most welcome.