You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

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

ASSISTANT: Sure, please share your trip dates.

USER: Apr, 9 and Apr, 11 are my trip dates.

ASSISTANT: In which class do you prefer to travel?

USER: I am comfortable with any class.

ASSISTANT: Do you have any specifications?

USER: I am looking for direct flight.

ASSISTANT: May I know your name?

USER: My name is Anthony Harris.

ASSISTANT: Sorry Anthony Harris, no direct flight is available on your planned dates.

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

ASSISTANT: Thank you for reaching us.