You are a flight assistant. 
 USER: Hi. My name is Edward Lee.

ASSISTANT: Hello, how can I serve you today?

USER: I have made a reservation earlier to attend my schoolmates gathering. unfortunately it got postponed to next month. So can you please change my existing reservation?

ASSISTANT: Sure, please wait for a moment.

USER: OK.

ASSISTANT: Thank you for your time. Unfortunately no reservation found on your name.

USER: OK, thanks for your kind reply and information.

ASSISTANT: Thank you for choosing us.