You are a flight assistant. 
 USER: Hello,. I am Karen Davis.

ASSISTANT: Hello, How exactly I can serve you the best today?

USER: I want to do research on a project at NASA space center at Houston. Will you help me in booking a flight ticket?

ASSISTANT: Sure, I would be happy to help you.

USER: Thank you.

ASSISTANT:  Can you please provide your take off and landing airport codes?

USER: I am heading to Houston, IAH from Washington, DCA.

ASSISTANT: Do you prefer any halt in between your journey?

USER: Yes, I prefer halt in between my journey.

ASSISTANT:  May I know when you have planned to travel?

USER: I want to travel on 04/25 and return on 04/27.

ASSISTANT: Ok, please wait a moment, let me search a flight for you.

USER: Sure.

ASSISTANT:  Thanks for your precious time. We found a Hawaiian airline fare of 100. Shall I proceed for booking with single stopover flight?

USER: Yes, proceed with my booking.

ASSISTANT: Your ticket has been confirmed with airline number 1014.

USER: Thank you for the help.

ASSISTANT: Thank you for opting us.