You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I would like to travel from IAD to SFO as a business trip.

ASSISTANT: Sure, I am willing to help you for this. When are you planning your trip?

USER: My trip dates are 10/01 and 10/03.

ASSISTANT: May I know your name please?

USER: Kathleen White here.

ASSISTANT: Is there any connection limit?

USER: I need only direct flight.

ASSISTANT: Do you have any other specifications?

USER: Departure time should be evening.

ASSISTANT: Sorry for inconvenience, no flights are found with your specifications.

USER: No problem, Thanks for the information.

ASSISTANT: You are most welcome.