You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Kenneth White.

ASSISTANT: How can I assess you at this time?

USER: I need to change my reservation as my exams got postponed to some other day. Can you please help me out?

ASSISTANT: Sure, I am cheerful to help you in ticket modification.

USER: Thank you for reacting positively.

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: No reservation has obtained on my search with your requested name in our booking list.

USER: It's ok, anyway thank you for the information.

ASSISTANT: It's my pleasure and have a nice day.