You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: I am Kathleen Garcia.

ASSISTANT: Ok.

USER: Please, help me in changing my existing reservation as my plan to go for a film festival got postponed.

ASSISTANT: Sure, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, there was no reservation found with your name.

USER: No problem. Thank you for the information.

ASSISTANT: Thank you for opting us.