You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: Can you help me to change my reservation?

ASSISTANT: Sure, I am here to help you with that, can I know your good name to proceed further?

USER: I am Melissa Gonzalez.

ASSISTANT: Sorry, no reservation is found on your name in our database.

USER: No problem, thank you for checking.

ASSISTANT: Thank you for opting us.