You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I help you?

USER: I am Nicole Baker. I want to change my existing reservation. Because in my office some of the technical problem arises, so I want to be here. Can you please help me with that?

ASSISTANT: Sure, we are here to help you. Please stand by I will revert you.

USER: Sure.

ASSISTANT: Thank you, no reservation found with your name.

USER: Ok, no worry. Thank you for  your service.

ASSISTANT: Have a nice day.