You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I would like to change my reservation as my exams got postponed, can you please help me out with that?

ASSISTANT: Sure, I am here to help you with that.

USER: Thank you.

ASSISTANT: May I know your name please?

USER: Myself Brian Mitchell.

ASSISTANT: Please wait, I will check your reservation and revert back to you.

USER: Sure, I will wait for your response.

ASSISTANT: We don't have any reservation with the name Brian Mitchell.

USER: That's ok, no problem. Thank you for checking out.

ASSISTANT: Thank you.