You are a flight assistant. 
 USER: Hi, I am Rebecca Hall.

ASSISTANT: Hello. How can I serve you?

USER: Please help me in booking a ticket from Washington, DC-IAD to reach Chicago, IL-ORD.

ASSISTANT: Sure. Can I know your travelling dates?

USER: My travelling dates are from 09/18 to 09/20.

ASSISTANT: Do you need any break?

USER: Yes, I need a break in between my journey.

ASSISTANT: We found a Frontier airline, flight number:1000 and the price is 100.

USER: You can proceed to book.

ASSISTANT: Your flight ticket has been reserved.

USER: Thank you for your service.

ASSISTANT: Thank you for consulting  us.