You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: I am Charles Taylor. I like to change my reservation for a small reason, can you help in that?

ASSISTANT: Sure, I am here to help you. Please wait for a moment. Sorry, there is no previous reservation found on your name.

USER: Thank you for your help.

ASSISTANT: Thank you for reaching us.