You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I best serve you today?

USER: Due to my exam got postpone, Can you do the changes in my existing reservation?

ASSISTANT: Sure, we are here to help you. To proceed with booking we need your name to check in our reservation list.

USER: Nicole Gonzalez here.

ASSISTANT: Please wait for a moment, I will revert to you.

USER: Ok.

ASSISTANT: That you for your time. There is no reservation found on your name. Thank you for availing with us.

USER: No problem, Thank you for quick response.