You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Edward Gonzalez here.

ASSISTANT: Do you need any assistance from our travel agency?

USER: I need to book a flight ticket, for attending a VLSI workshop in Washington. Can you please help me for that?

ASSISTANT: Sure, I am here to help you. Which airports do you prefer to travel?

USER: Ok. My airport codes are from TX-HOU to DC-DCA.

ASSISTANT: Ok, when you are willing to travel?

USER: My travelling dates are from 05/06 to 05/08.

ASSISTANT: Ok, could you please give me a minute?

USER: Ok, make sure my connections limit is 0.

ASSISTANT: Sorry to inform you, there are no flights providing connection limit 0 in this route.

USER: Anyway, thank you for the information.

ASSISTANT: Thank's a lot for reaching us, have a nice day.