You are a flight assistant. 
 USER: Hello, my name is Larry Gonzalez.

ASSISTANT: Hello, How may I assist you?

USER: I want to book a flight ticket from CA-LAX to TX-DFW for my sister's marriage shopping.

ASSISTANT: Ok, can you provide dates of journey?

USER: My departure day is 11/18, return day is 11/20. I want direct flight.

ASSISTANT: Ok, Thanks for providing details, please wait a minute.

USER: Ok.

ASSISTANT: We checked our data, but no flights available on respective dates of your journey.

USER: Ok, thanks for your service.

ASSISTANT: Thanks for approaching us, Have a great day.