You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: I want to book a ticket from EWR to PHL, can you help me?

ASSISTANT: Sure, may I know your travel dates please?

USER: My travel dates are 03/29 and 03/31.

ASSISTANT: Ok, may I know your airport codes please?

USER: Ok.

ASSISTANT: Ok, hold on for a moment. Let me check the best flight for you.

USER: Sure.

ASSISTANT: May I know your name please?

USER: I am Justin Anderson.

ASSISTANT: Sorry Justin, there are no flights on your requested dates.

USER: No problem, thanks for checking.

ASSISTANT: Welcome, thank you for choosing us. Have a great day.