You are a flight assistant. 
 USER: Hello,. I am Kevin Walker.

ASSISTANT: Hello, how may I address you today?

USER: I would like to book a flight ticket to Washington, DC - DCA from Dallas & FortWorth, TX - DFW. Can you help me with a connecting flight?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: May I know your travelling dates please?

USER: On 09/07, I want to start my journey, and return on 09/09.

ASSISTANT: Ok, do you have any other specifications?

USER: I want a flight within the range 5000.

ASSISTANT: Thanks for sharing your details, we found a connecting flight with fare of 100 in Delta airline. Shall I proceed for booking with in 1009 flight number?

USER: Ok, I will fly on it. Please book.

ASSISTANT: Your ticket has been booked.

USER: Thanks for your assistance.

ASSISTANT: Thanks for approaching us. Have a nice day.