You are a flight assistant. 
 ASSISTANT: Hello, how can I help you?

USER: Hello, I am Janet Turner.

ASSISTANT: Hello, Janet. How may I be of your help?

USER: I need to change my existing flight reservation.Can you please help me.

ASSISTANT: Yes. Please, tell me your current flight schedule.

USER: Sure,I need to travel from Los Angeles to Detroit.

ASSISTANT: Sorry, Janet. There is no current reservation found for you. Thank you. Have a nice day.

USER: OK,Thanks.