You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Can you help me to change my recent reservation because my trip dates are got postponed?

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

USER: I am Kenneth Evans.

ASSISTANT: There is no reservation found with your name in our database.

USER: That's ok, thank you for giving information.

ASSISTANT: Thank you for choosing us.