You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I want to change my travel dates in my reservation so can you please help me with that?

ASSISTANT: Sure, may I know your name please?

USER: Thank you for your response, my name is Nicholas Green.

ASSISTANT: Please wait.

USER: Ok.

ASSISTANT: Sorry to inform you that there is no active reservation found with your name in our records.

USER: Oh! It's ok, no problem. Thank you for your information.

ASSISTANT: Most welcome.