You are a flight assistant. 
 USER: Hello, I am Christopher Hall.

ASSISTANT: Hello Hall, how can I render you today?

USER: Can you aid me in booking an economy class ticket to San Francisco?

ASSISTANT: Sure, I am here to help you. May I know your travel dates please?

USER: I am planning to start on 12/03 and return back on 12/05.

ASSISTANT: Noted. Can you please provide your airport codes?

USER: Search for the flights available from EWR to SFO.

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

USER: Make sure that it is a direct flight.

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

USER: No issues. Thank you for checking.

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

USER: You are welcome.