You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: Can you help me to book a flight from DFW to LAX?

ASSISTANT: May I know your trip dates?

USER: My trip dates are Mar 26 and 28.

ASSISTANT: Do you prefer any specifications?

USER: I prefer direct flight.

ASSISTANT: May I know your name?

USER: Sure, I am Virginia Jones.

ASSISTANT: Sorry, no flights found on your route.

USER: No issues, thank you for your time.

ASSISTANT: Thank you.