You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I need to change my reservation, can you help me?

ASSISTANT: Sure, may I know your name?

USER: I am Pamela Lopez.

ASSISTANT: Hold on a minute.

USER: Sure.

ASSISTANT: Sorry, we could not find any reservation on your name.

USER: That's ok. Thank you.

ASSISTANT: Thank you for choosing us.