You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I made a reservation earlier to attend a meeting, unfortunately it got postponed at end of the moment. So, can you help me in changing my reservation?

ASSISTANT: Sure, we can help you with that. May I know your name to check your previous details?

USER: I am Nicholas Hill.

ASSISTANT: Ok, please wait.

USER: Ok.

ASSISTANT: Sorry to inform you Nicholas Hill, there is no reservation found under your name.

USER: It's ok. Thank you for the information.

ASSISTANT: Thank you for reaching us.