You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I serve you today?

USER: As my exams got postponed I need to change my reservation, can you please help me out?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your good name to check in the previous list?

USER: Sure, please check the reservation on the name of Alexander Robinson.

ASSISTANT: Please give me a minute.

USER: Ok.

ASSISTANT: Thanks for your precious time, there is no active reservation found on your name.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for approaching us.