You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you now?

USER: I need to change my recent reservation due to my exams, can you help me?

ASSISTANT: Sure, I am oblige to help you with that.

USER: Thank you.

ASSISTANT: Please provide your name to check in our database for your reservation.

USER: I am Andrew Green.

ASSISTANT: Hold on a moment.

USER: Sure, take your time.

ASSISTANT: We regret to notify that, there is no reservation found on your name in our records.

USER: Ok, no issues. Thank you for the information.

ASSISTANT: Thank you for approaching us, have a great day.