You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: My holiday trip has been postponed.So I need to change my reservation. Can you please change my reservation?

ASSISTANT: Sure, please provide me your name.

USER: Samuel Miller is my name.

ASSISTANT: There is no reservation found with your specified name.

USER: Ok, no issues. Thanks for your service.

ASSISTANT: Thank you.