You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: I would like to book a flight ticket from IAD to attend a robotic workshop at SFO, can you help me to book a flight  ticket?

ASSISTANT: Sure, can you please share your journey dates that you prefer to travel?

USER: I have planned to travel on dates Nov 16 and Nov 18.

ASSISTANT: Do you require any stopovers in your journey?

USER: No, I need a direct flight.

ASSISTANT: Would you let us know if you have any other preferences?

USER: I want to depart at evening and return in the evening.

ASSISTANT: May I know your name?

USER: My name is Linda Evans.

ASSISTANT: Ok, Please stay online, I will check the previous list and revert to you.

USER: Sure, take your time.

ASSISTANT: Sorry to say, no flights found with your requirement.

USER: That's fine, thank you for the response.

ASSISTANT: Thanks for reaching us.