You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I serve you at this moment?

USER: I want to travel from HOU to DCA. Please help me in booking my ticket.

ASSISTANT: Sure, provide your travelling dates.

USER: My travelling dates are from 09/18 to 09/20.

ASSISTANT: Ok, share your class preference.

USER: There is no class preference for me.

ASSISTANT: Ok, can you please share your connection limit?

USER: I need a single connecting flight.

ASSISTANT: Ok, do you have any airline preference?

USER: I am looking for normal cost airline.

ASSISTANT: Ok, at what time would you like to depart and return?

USER: There are no particular timings for me to travel.

ASSISTANT: Ok, please wait for few minutes.

USER: Sure.

ASSISTANT: We found a American airlines with fare of 200 and a connecting flight with economy class matches your schedule. Shall I proceed with booking?

USER: Please proceed with the booking.

ASSISTANT: Your ticket has been confirmed with flight number 1018 which depart at 9:00 AM and arrival at 20:00 PM.

USER: Thank you for your help.

ASSISTANT: Thank you for reaching us.