You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I serve you today?

USER: Will you please assist me to book a ticket from  DFW to IAD?

ASSISTANT: Sure, could you please let me know your dates of journey?

USER: My travelling dates are on Oct 08 and Oct 10.

ASSISTANT: May I know your name please?

USER: My name is Richard Green.

ASSISTANT: Do you have any other requirements please?

USER: No.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: There is a couple of connections limit of fare 400 with the UA airline, are you ok with this booking?

USER: I need single connecting flight.

ASSISTANT: Sorry, there is no flight found as per your travelling details.

USER: Ok, thank you for informing me.

ASSISTANT: You are welcome.