You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I want to change an existing reservation. Can you please help me out?

ASSISTANT: Sure, can I have your name please?

USER: My name is Jacob Adams.

ASSISTANT: Sorry, there is no reservation found on your name. Want to have any more information please?

USER: No.

ASSISTANT: OK, thank you and have nice day.

USER: OK, thank you for your information.