You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I render you?

USER: I am looking for a flight from IAD to OAK, can you help me?

ASSISTANT: Sure, I can help you. May I know your itinerary dates?

USER: I want to fly on 17 June and return on 19 June.

ASSISTANT: Do you prefer a stopover in your journey?

USER: I need a direct flight.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: May I know your name?

USER: Nicole Lopez.

ASSISTANT: Sorry Nicole Lopez, no direct flight is available on you planned dates.

USER: It's ok, not a problem, thank you.

ASSISTANT: Thank you for approaching us.