You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: Can you aid me to book my ticket from IAD to OAK?

ASSISTANT: Sure, can you please let me know trip dates?

USER: My trip dates are Sep 15 and Sep 17 respectively.

ASSISTANT: Do you have any connection limit preference?

USER: I prefer for single connecting limit.

ASSISTANT: Do you have any other specifications?

USER: No other specifications.

ASSISTANT: Could you help me with your name please?

USER: Melissa Carter here.

ASSISTANT: I found a connecting flight with Frontier Airlines and the airfare is about 200. Shall I proceed with flight 1005?

USER: Please book the ticket.

ASSISTANT: For a economy class your ticket is booked.

USER: Thank you for the help.

ASSISTANT: Thank you for reaching us.