You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Dorothy Rodriguez. I need to change my existing reservation, can you please help me out?

ASSISTANT: Dorothy Rodriguez. How can I help you? Sure, can you give me a moment?

USER: Sure.

ASSISTANT: I regret to inform that there is no reservation by the name Dorothy Rodriguez.

USER: That's ok, thank you for searching my details.

ASSISTANT: Thank you for reaching us.