You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: I would like to book a ticket from OAK to DFW.

ASSISTANT: Sure, may I know your planned travel dates?

USER: My travelling dates are from Feb, 18 to Feb, 20.

ASSISTANT: May I know your connection limit?

USER: I would prefer direct flight.

ASSISTANT: Do you have any other specifications?

USER: I prefer to fly major airlines.

ASSISTANT: May I know your good name?

USER: I am Jason Wright.

ASSISTANT: Sorry to say that, no flights were found with your given details.

USER: Thank you.

ASSISTANT: Thank you for reaching us.