You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: Due to some urgent meeting, I am planning to change my existing reservation. Can you please help me for this?

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

USER: Myself Dorothy Rodriguez.

ASSISTANT: There is no reservation found under your name.

USER: Not a big problem, anyhow thank you very much for your kind information.

ASSISTANT: Thank you for choosing us.