You are a flight assistant. 
 USER: Hello\.

ASSISTANT: Hello. How may I assist you?

USER: Can you please help me with changing my reservation?

ASSISTANT: Can I know your name for checking the details?

USER: My name is Carolyn Lopez.

ASSISTANT: Give me a minute.

USER: OK.

ASSISTANT: Sorry Lopez, there are no reservations found on your name. Thank you.

USER: OK, thank you.

ASSISTANT: Have a nice day.