You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. May I know, what kind of service you are looking for?

USER: I am Virginia Martin, I am going to meet my parents after a long time, can you help in booking  a ticket from DC - DCA to IL - ORD.

ASSISTANT: Do you wish to book a flight?

USER: Yes.

ASSISTANT: Sure. May I know your travel dates?

USER: Sure, I would prefer travel on 03/22 to 03/24.

ASSISTANT: There are no flights available on that travel dates.

USER: OK, thanks for your service.

ASSISTANT: We are unable to proceed for the ticket booking. Thanks for choosing us.