You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: Could you please book a flight ticket from IAD to JFK as I need to attend a seminar in my college?

ASSISTANT: Ok, can you give me your trip dates?

USER: My travelling dates are Mar 17 and Mar 19.

ASSISTANT: Do you need any connections?

USER: No, I need a direct flight.

ASSISTANT: Are there any other preferences?

USER: No.

ASSISTANT: May I know your name?

USER: My name is Nicholas Robinson.

ASSISTANT: Sorry to say that, there is no flight found with your details.

USER: Not a problem, thank you for the information.

ASSISTANT: Thank you for reaching us.