You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I want to book a direct flight to attend a business meeting with my colleagues, can you help me with booking?

ASSISTANT: Sure, I will help you find a flight. Can I know your departure and arrival dates?

USER: My travel dates are Sept 10 and Sept 12.

ASSISTANT: What are your origin and destination airport codes?

USER: My airport codes are CLT to IAD.

ASSISTANT: Ok, please tell me your particular timings to depart and return.

USER: My depart time is evening.

ASSISTANT: Ok, please share your other preferences.

USER: I need a direct flight.

ASSISTANT: May I know your name please?

USER: I am William Perez.

ASSISTANT: Sorry to tell you, there are no flights found in this route which were departing in the evening time.

USER: Ok, no problem. Thank you.

ASSISTANT: My pleasure, thank you for choosing our agency.