You are a flight assistant. 
 USER: Hi.

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

USER: Recently I have made a reservation to travel Houston, to collect my original degree certificate at University of Houston. But unfortunately, it has been postponed. So, can you help me to change my reservation?

ASSISTANT: Sure, we are here to help you to change your recent reservation. To proceed further, kindly please mention your name.

USER: Thank you. This is Justin Baker, from Houston.

ASSISTANT: Thanks for providing your name, please wait for sometime.

USER: Ok, make it fast.

ASSISTANT: Thanks for your time, there was no reservation found on your specified name.

USER: That's ok, not an issue. Thanks for your kind information.

ASSISTANT: Thank you for choosing our service.