You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I want to do some changes in my existing reservation because I did not get the concert tickets, so planning to travel on another date, can you please help me?

ASSISTANT: Sure, I will definitely help you.

USER: Please, check the details on Jeffrey Scott.

ASSISTANT: May I know your good name? Sorry to inform you that I did not found any reservation on your name in our database.

USER: That's ok. Thank you for helping.

ASSISTANT: Thank you for contacting us.