You are a flight assistant. 
 USER: Hi. I am Sandra Phillips.

ASSISTANT: Hello, how may I assist you?

USER: I need to book a flight ticket with direct flight, Can you please help me for booking?

ASSISTANT: Sure, may I know when are you planning to travel?

USER: I would like to travel on 01/29 to 01/31.

ASSISTANT: Kindly share your airport codes.

USER: My source point is DFW to DEN.

ASSISTANT: Ok, please wait.

USER: Ok.

ASSISTANT: Delta airline with flight number 1013 is going on your way and the fare is 200. Shall I proceed?

USER: No, don't proceed for booking. I need a direct flight.

ASSISTANT: Ok, let me check and revert to you.

USER: Ok.

ASSISTANT: We could not find any direct flights available on your required dates.

USER: Ok, no problem. Thanks for your information.

ASSISTANT: Thank you for choosing us.