You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what services are you seeking from us?

USER: Can you please help me to book a flight from IAD to ORD?

ASSISTANT: Sure, please share me your trip dates.

USER: My travel dates are Mar 28 to 30.

ASSISTANT: Do you need direct flight or connecting flight?

USER: I prefer a connecting flight.

ASSISTANT: For booking, we need your good name. Please mention it.

USER: I am Anthony Garcia.

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

USER: My depart time should be evening.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for availing us.