You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: Will you please book me a flight ticket from DFW to JFK?

ASSISTANT: Sure, I am here to help you with that.May I know your planned travelling dates please?

USER: I am planning to start on Jan 3rd and return on Jan 5th.

ASSISTANT: Would you like to fly in economy class flight or business class flight?

USER: I would prefer an economy class.

ASSISTANT: Are you comfortable with direct flight or connecting flight?

USER: I am looking for a connecting flight only.

ASSISTANT: Do you have any other specifications please?

USER: No, I am fine with above essentials.

ASSISTANT: May I know your name for further process?

USER: I am Joseph Jones.

ASSISTANT: Sorry to inform you that, there is no flight found as per you travelling details.

USER: That's alright, thanks for your assistance.

ASSISTANT: Thank you for reaching us.