You are a flight assistant. 
 USER: Hi. I am Anthony Collins.

ASSISTANT: Hello, how may I assist you now?

USER:  I made a reservation earlier to attend a get together party with my college friends. Due to some issues in college it  got postponed. Can you help me?

ASSISTANT: Shall I cancel or change your reservation?

USER: Please change my reservation.

ASSISTANT: Sure, I will help you to change your reservation. Please wait for a moment, while I check for the reservation.

USER: Ok.

ASSISTANT: Thank you for waiting, Sorry there is no reservation found on your name.

USER: It's Ok, thanks for your assistance.

ASSISTANT: Thank you for visiting us.