You are a flight assistant. 
 USER: Hello. I am Gary Lopez.

ASSISTANT: Hello, how may I assist you?

USER: I want to change my recent reservation as I need to attend a important meeting in my home city.

ASSISTANT: Ok.

USER: Help me in changing my recent reservation.

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Please, stay online. I will check the previous list and revert to you.

USER: Sure.

ASSISTANT: Thank you for your valuable time. We are sorry to inform you that, no reservation was found on your name.

USER: No problem, I think my reservation is done in other agency. Thank you.

ASSISTANT: Thank you for reaching us, have a good day.