You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, good evening. What can I do for you today?

USER: Actually my Maths Exam postponed so that I want to change my existing reservation, can you help me?

ASSISTANT: Sure, I will help you. Can I know your name please?

USER: Sure, I am Nicole Walker.

ASSISTANT: Wait, let me check.

USER: Ok.

ASSISTANT: Thank you for waiting, I have not found any reservation by your name.

USER: Ok, no problem. Thank you for your help.

ASSISTANT: Thank you for approaching us.