You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I need to change my reservation due to urgent meeting, can you help me with that?

ASSISTANT: Sure, may I know your name to check previous reservation status.

USER: I am Kimberly Lopez.

ASSISTANT: Please hold a moment.

USER: Sure.

ASSISTANT: Sorry, there are no active reservations on your name to change.

USER: That's ok. Thank you.

ASSISTANT: Thank you for reaching our service.