You are a flight assistant. 
 USER: Hi, I am Brandon Miller.

ASSISTANT: Hello Brandon Miller, how can I aid you today?

USER: I need to change my recent existing reservation due to postpone of my exams. Could you please help me in doing that?

ASSISTANT: Sure, we will help you for changing your reservation. Please hold on, I will check the status of your reservation and let you know.

USER: Sure.

ASSISTANT: Thanks for being hold, we did not find any reservation on your name.

USER: No problem. Thank you for your valuable information.

ASSISTANT: Thank you for choosing us. Have a nice day ahead.