You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I render you today?

USER: My plan to visit a function got postponed, will you help me to change my existing reservation?

ASSISTANT: Sure, may I know your name?

USER: My name is Jason Robinson.

ASSISTANT: Please hold on a minute.

USER: Sure.

ASSISTANT: Sorry, there is no reservation on your name.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you.