You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Larry Martin here.

ASSISTANT: How can I aid you?

USER: I would like to travel from SFO to DCA. could you please help me to book a ticket?

ASSISTANT: Sure. May I know your travelling dates?

USER: My travelling dates will be on 07/04 to 07/06.

ASSISTANT: Do you have any preferences?

USER: I need a connecting flight. Fare is 500.

ASSISTANT: There is a flight 1028 in Delta airline and price 100 with a connection. Shall I proceed?

USER: You can proceed to booking.

ASSISTANT: Your reservation is done.

USER: Thank you.

ASSISTANT: Thank you.