You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Frank Walker.

ASSISTANT: How may I aid you?

USER: Can you please book a flight ticket form IAD to JFK locations?

ASSISTANT: Yes, can you please provide the departure and arrival dates?

USER: Sure, my travelling dates are from 04/21 and 04/23.

ASSISTANT: Ok, please hold on for a moment and I will get back to you.

USER: Make sure that I want a direct flight because I have to attend a emergency meeting.

ASSISTANT: Sorry, there are no flights available with 0 connection on your requested dates.

USER: That's ok. Thank you for the information.

ASSISTANT: Thank you, have a nice day.