You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you today?

USER: I need to book a flight ticket from DCA to IAH, can you help me in booking a flight ticket?

ASSISTANT: Sure, we are mirthful to assist you in booking. Help me with your journey dates, so that it will be easier to move further in booking.

USER: Sure, my scheduled dates are May 2 and May 4.

ASSISTANT: Do you need a stopover in between your journey?

USER: I prefer maximum one connection.

ASSISTANT: May I know your name please?

USER: Sure, Timothy Brown here.

ASSISTANT: Is there any other preferences that you would like to add before booking?

USER: I would prefer return time at afternoon.

ASSISTANT: Thank you for providing all necessary details. Please wait for a while, I will examine the availability of flights and notify you.

USER: Sure.

ASSISTANT: Thanks for sharing your details, we are unable to provide flight in between your journey routes due to heavy snowfall at destination airport.

USER: Ok, no issues. Thank you for your assistance.

ASSISTANT: Thank you for choosing us.