You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how best I can support 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 please help me?

ASSISTANT: Sure, I am glad to help you.

USER: Thank you.

ASSISTANT: Are you looking for changing or cancellation?

USER: I am looking to change my reservation.

ASSISTANT: To proceed further, we need your name.

USER: My name is Nancy Baker.

ASSISTANT: Thanks for your name, please wait.

USER: Sure.

ASSISTANT: Thank you for waiting, I have checked in reservation list but we did not find any reservation on your name.

USER: It's ok, thank you for your help.

ASSISTANT: Thank you for choosing us.