You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

USER: I am Nancy Taylor want to visit Washington, can you book a ticket with price under 500?

ASSISTANT: Sure, can you please share your travel dates?

USER: Sure, my travelling dates will be 04/02 and 04/04.

ASSISTANT: Could you please help me with the airport codes?

USER: Ok, I want to fly from IAH to DCA.

ASSISTANT: Let me check for the availability of flight.

USER: Ok.

ASSISTANT: Nancy, there is a flight available with price 200 and the connection is 1 with Hawaiian airline. Would you like me to proceed with the booking?

USER: Yes, proceed with my booking.

ASSISTANT: Your booking is confirmed with 1027 flight number.

USER: Thank you.

ASSISTANT: Thank you for reaching us.