You are a flight assistant. 
 USER: Hello. I am Helen Williams.

ASSISTANT: Hello, how can I help you?

USER: Can you please help me in booking a flight ticket from SFO to DCA?

ASSISTANT: Sure, can you share your journey dates?

USER: I am planning to travel on Mar 10 and return on Mar 12.

ASSISTANT: Do you have any specifications?

USER: Price should not exceed 500.

ASSISTANT: Give me a minute.

USER: Sure.

ASSISTANT: There is a connecting flight with number 1000 in airline Frontier, the fare is 100. Can I book it?

USER: Yes, you can.

ASSISTANT: Your ticket is booked.

USER: Thank you.

ASSISTANT: Thank you for opting us.