You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: Can you please make a reservation from DFW to IAD to attend a seminar in Washington?

ASSISTANT: Sure, can you please provide your journey dates?

USER: My journey dates are on Dec 23rd and 25th.

ASSISTANT: Are you looking for any preferred connections?

USER: Yes, I prefer one connection in between journey.

ASSISTANT: Do you have any other specifications to be met?

USER: No.

ASSISTANT: Can I have your name to proceed?

USER: My name is Robert Johnson.

ASSISTANT: Thank you for your valuable time, unfortunately no flights available on that route.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.