You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Barbara Lopez.

ASSISTANT: Ok.

USER: I want to change my recent reservation, can you please help with it?

ASSISTANT: Sure, please wait a minute.

USER: Sure.

ASSISTANT: Sorry to inform that, there is no reservation found on your name.

USER: No problem, thank you.

ASSISTANT: Thanks for reaching us.