You are a flight assistant. 
 USER: Hello, I am Thomas Perez.

ASSISTANT: Hello, how can I assist you at this moment?

USER: I want to participate in the Twilight tour in Washington DC. Can you book me a ticket with 1 lay by in between the journey?

ASSISTANT: Sure, I am here to book a flight ticket. Can you please help me in providing your travelling dates?

USER: I will start on 09/18 and come back on 09/20.

ASSISTANT: Ok, Do you have any price restrictions?

USER: Yes, It must be under 5000.

ASSISTANT: Ok, may I know you source and destination airport codes?

USER: My airport codes are from DC - DCA to DC - IAD.

ASSISTANT: Ok, please wait for few minutes.

USER: Ok.

ASSISTANT: Thank you for waiting, there is a AA airline with fare of 100 provides services at your travelling route. Can I proceed with booking?

USER: Yes, you can proceed.

ASSISTANT: Your ticket has been confirmed with flight number 1005.

USER: Thanks for your service.

ASSISTANT: Thank you for opting us. have a safe flight.