You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What help that you are seeking from my end?

USER: I am Joseph Hernandez, I need to amend my reservation as my exams got postponed. Can you please help me to change my reservation?

ASSISTANT: Sure, please give me a moment to check it.

USER: Thank you for the assistance.

ASSISTANT: I am unable to find your ticket reservation in our ticket booking list to modify it, I think it is not booked properly while you are booking.

USER: It's ok, anyway thank you for your quick response and it might not be booked correctly at the time of booking.

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

USER: You are most welcome.