You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Due to inconvenience of my work, I want to change my reservation. Can you please help me for that?

ASSISTANT: Sure, wait for a minute please.

USER: Ok, I will wait.

ASSISTANT: May I know your name please.

USER: I am Jacob Lopez.

ASSISTANT: Ok. Thanks for waiting. But I am sorry to say that there is no reservation on your name to change it.

USER: Anyway, thanks for the information.

ASSISTANT: Thank you.