You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Stephen Scott.

ASSISTANT: I hope you are good today, how can I help you Scott?

USER: Can you help me for changing my existing reservation?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Did you reserved the ticket on the name Scott or any other name?

USER: Yes, it is reserved on the name of Stephen Scott only.

ASSISTANT: There is no reservation on your name in our database.

USER: Oh! It's ok, I think my brother already changed my reservation.

ASSISTANT: Thank you for opting us.