You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: Due to sudden change of my business meeting because of some technical problem, I need to change my reservation so can you help me with that?

ASSISTANT: ure, I am here to help you. Can you please let me know your good name?

USER: I am Donald Perez.

ASSISTANT:  Sorry, we did not find any active reservation on your name in our records.

USER: No problem, thanks for the information.

ASSISTANT: Thank you for choosing us.