You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I got a chance to play a football match for Washington team at Houston.Can you please help me to book a flight ticket with one connection?

ASSISTANT: Sure, May I know your travel dates?

USER: My match is on 08/22, so you can book me a tickets from 08/21 to 08/23.

ASSISTANT: Please provide me your airport codes.

USER: My airport codes are from DC-IAD and return to TX-HOU. Please make sure that my price limit is 1000 to book a ticket.

ASSISTANT: We do not have flights on your requested dates. May I know your name for documentation purpose?

USER: Not a problem. My name is David Smith.

ASSISTANT: Thank you for contacting us.

USER: Thanks for your information.