You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I guide you now?

USER: I want to book a ticket from DCA to HOU.

ASSISTANT: Sure, I am happy to you with that. May I know your journey dates for further search process?

USER: Travelling dates are Jan, 16 and Jan, 18.

ASSISTANT: Let me know about your connection limit for your journey.

USER: I prefer connecting flight.

ASSISTANT: May I know your class preference, please?

USER: I am comfortable with any class preference.

ASSISTANT: Can you please provide me your airline preference?

USER: I prefer normal-cost airline.

ASSISTANT: Please, provide me your departure and arrival timings.

USER: I would like to return in the evening time.

ASSISTANT: May I know your name to proceed further?

USER: My name is Brandon Evans.

ASSISTANT: Sorry, there are no flights found on your desired routes based on your specifications.

USER: Thank you.

ASSISTANT: Thank you for choosing us, have a great day.