You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How exactly I can serve you the best today?

USER: Could you please help me to change my existing reservation due to postpone of my exams?

ASSISTANT: Sure, I can change your reservation right now. Before that I need to know your good name please?

USER: My name is Nicole Martin.

ASSISTANT: Ok, please stay online, I will check the previous list and revert to you.

USER: Sure.

ASSISTANT: We are sorry to say that, there is no active reservation found on your name.

USER: Not a problem, thank you for checking.

ASSISTANT: Thanks for choosing us, wish you a great day.