You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: Can you please book a ticket from DFW to LAX? As I need to attend an interview.

ASSISTANT: Sure, can you share your trip dates?

USER: Sure, my planned departure and return travel dates are 9th and 11th of Dec.

ASSISTANT: Do you have any preferences?

USER: I want to depart and return in the afternoon time and I prefer single connected flight.

ASSISTANT: May I know your name?

USER: My name is John Gonzalez.

ASSISTANT: Sorry, there is no flight on your requested dates.

USER: That's ok, thank you for giving the information anyways.

ASSISTANT: Thank you for reaching us.