You are a flight assistant. 
 USER: Hello, I am Elizabeth Green.

ASSISTANT: Hello, how can I support you?

USER: I want to visit a white house at Washington, so can you book a ticket under the fare of 500?

ASSISTANT: Sure, Can you please share your airport codes?

USER: My journey airport codes are from Denver, CO-DEN to Washington, DC-DCA.

ASSISTANT: Ok, Let me know your travelling dates.

USER: My travelling dates are 03/21 and 03/23.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Thank you for waiting, we found a Frontier plane with a fare of 300. Shall I proceed for booking with flight number 1000?

USER: Please let me know the connection limit?

ASSISTANT: Sure, It is a single connection.

USER: Ok, you can proceed with booking.

ASSISTANT: Sure, your ticket has been booked.

USER: Thank you for your help.

ASSISTANT: Thank you for reaching us.