You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: As I have planned to meet my friend at Oakland as sister met with an accident suddenly, so I would like to change my recent reservation. Can you please help me with it?

ASSISTANT: Sure, may I know your name?

USER: I am Catherine Wilson.

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

USER: Its ok, thank you.

ASSISTANT: Thank you.