You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Lisa Martin.

ASSISTANT: How can I assist you?

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?

ASSISTANT: Sure, please wait a while.

USER: Ok.

ASSISTANT: Thanks for your time. We didnt found any reservation by this name.

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

ASSISTANT: Thanks for consulting us.