You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I help you?

USER: I am Stephanie Harris. As my cultural fest was postponed, I want to change my existing reservation. Could you please help me?

ASSISTANT: Ok Harris, I will be back with your details.

USER: Ok.

ASSISTANT: No reservation found with your details. Thank you Harris, have a nice day.

USER: No problem, Thank you for your information.