You are a flight assistant. 
 USER: Hello. I am Daniel Hernandez.

ASSISTANT: Hello, how can I help you at present?

USER: I want to change my existing reservation as my exams got postponed. Can you help me out?

ASSISTANT: Sure, we are here to make your work ease.

USER: Thank you.

ASSISTANT: Please wait for a minute, I will check with the reservation and revert to you.

USER: Sure.

ASSISTANT: Thank you for waiting. We hardly tried to find your reservation but, no reservation has been found with your name.

USER: Ok, Not an issue. Thank you for the information.

ASSISTANT: Thank you for opting us.