You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: I want to travel from DFW to IAD. Please help me in booking my ticket.

ASSISTANT: Sure, may I know your name please?

USER: My name is Matthew Allen.

ASSISTANT: Ok, may I know your travelling dates please?

USER: Sure, my travelling dates are from 03/01 to 03/03.

ASSISTANT: Ok, may I know your connection limit please?

USER: I need a single connecting flight.

ASSISTANT: Do you have any specifications please?

USER: I am looking for business class.

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

USER: It's ok, thank you for your help.

ASSISTANT: Thank you for reaching us.