You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you today?

USER: I am Steven Davis.

ASSISTANT: Yes Steven.

USER: Can you help me in changing my previous reservation?

ASSISTANT: Sure, I will help you in changing, please hold on for a moment to check your reservation status.

USER: Ok.

ASSISTANT: Steven, I did not find any reservation with your name in my database.

USER: That's ok. Anyway, thank you for your help.

ASSISTANT: It's my pleasure.