You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Will you please help me to change my reservation?

ASSISTANT: Sure, I will help you. May I know your name?

USER: I am Daniel Jackson.

ASSISTANT: Thank you. I will check your reservation status and let you know.

USER: Ok.

ASSISTANT: Sorry, I have not found any reservation under your name in our database.

USER: Ok, not a problem. Thank you.

ASSISTANT: You are welcome and have a nice day.