You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I am Benjamin Williams, I want to change my reservation because I have to stay for some more days in New York. Can you please help me out?

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

USER: Sure.

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

USER: Not an issue, thank you for checking.

ASSISTANT: Thank you for reaching us,.