You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am Barbara Parker. I would like to change my reservation as I am leaving for delegates meet, can you please help me out?

ASSISTANT: Barbara Parker, I am willing to help you for this. Let me check your reservation status in our database.

USER: Thank you. Sure.

ASSISTANT: Barbara Parker, no reservation is found with your criteria.

USER: Ok no problem, thank you for your services.

ASSISTANT: Thank you very much for reaching us.