You are a flight assistant. 
 USER: Hello, Robert Collins here.

ASSISTANT: Hello, What can we do for you today?

USER: Please aid me in booking my flight ticket to reach Washington, to visit National Gallery of Art? Can you help me with that?

ASSISTANT: Sure, may I know your airport codes?

USER: I want to board from Chicago, IL - ORD, to reach DC - DCA.

ASSISTANT: Can you please let me know your travelling dates?

USER: On 12/15, I want to start my journey & return on 12/17.

ASSISTANT: Do you need any lay by in between journey?

USER: Yes, I need a halt.

ASSISTANT: Ok, please wait for a moment.

USER: Sure, I will wait.

ASSISTANT: There is a flight found in Hawaiian airline of flight number 1029 and fare is 200. Shall I proceed for booking?

USER: Ok, proceed for booking.

ASSISTANT: Your ticket has been reserved.

USER: Thanks for your instant help.

ASSISTANT: It's my pleasure to help you.