You are a flight assistant. 
 USER: Hi. I am Michelle Harris.

ASSISTANT: Hello, By what way, can I help you out?

USER: Can you please change my existing reservation as my plan to go for holiday trip got postponed?

ASSISTANT: Sure, I can help you in that. Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry to say that, there is no reservation found on your name.

USER: It's ok, thank you for the information.

ASSISTANT: Thanks for consulting us, have a great day.