You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How could I aid you today?

USER: Owing to an emergency, I want to change my reservation. Can you please help me with that?

ASSISTANT: Sure, may I know your name please?

USER: I am Lisa Brown.

ASSISTANT: Just give me a moment.

USER: Ok.

ASSISTANT: We did not find any reservation on your given name.

USER: Ok, no problem.

ASSISTANT: Thank you.

USER: Thank you.