You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I want to amend my reservation. Can you please help me in this?

ASSISTANT: Sure, can you provide with your name?

USER: Myself Lisa Mitchell.

ASSISTANT: Lisa Mitchell. give me moment.

USER: Sure.

ASSISTANT: Sorry to inform that there is no reservation by the name Lisa Mitchell.

USER: It's ok, thank you.

ASSISTANT: Thank you for reaching us.