You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I am David Nelson. I want to book a flight ticket from DCA to IAH. Could you help me in booking?

ASSISTANT: Sure, we are mirthful to help you.

USER: Thank you.

ASSISTANT: Can I know your travelling dates, please?

USER: My travelling dates are from 12/01 to 12/03.

ASSISTANT: Do you have any requirements to be met?

USER: I need direct flight.

ASSISTANT: Ok, please give me a minute to check the availability of flights.

USER: Ok.

ASSISTANT: We found a connecting flight in Spirit airline of flight number 1006 having a fare 100. Shall I reserve your ticket?

USER: Yes, please proceed.

ASSISTANT: Your ticket has been reserved.

USER: Thank you for helping me.

ASSISTANT: Thank you for approaching us.