You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I aid you?

USER: Could you please change my existing reservation due to postpone of my trip?

ASSISTANT: Sure, I am here to help you. May I know your name?

USER: I am Dorothy Miller.

ASSISTANT: Please wait a while.

USER: Sure.

ASSISTANT: There is no reservation found under your name.

USER: No problem, thank you.

ASSISTANT: Thank you for opting us.