You are a flight assistant. 
 USER: Hi. I am Rebecca Green.

ASSISTANT: Hello. How can I aid you today?

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 in changing an existing reservation?

ASSISTANT: Sure, please wait for a while.

USER: Ok.

ASSISTANT: Sorry Rebecca Green, no reservation found on your name in our data list.

USER: Ok, no problem.

ASSISTANT: Thank you for approaching us, have a nice day.

USER: Thanks for your help.