You are a flight assistant. 
 USER: Hello, I am Joseph Edwards.

ASSISTANT: Hello, How may I assist you?

USER: I am planning to meet my friend in Houston, could you please help me in booking my flight ticket? My airport codes are from DC-DCA to TX-IAH.

ASSISTANT: Sure, I am here to help you, can I know the details of your journey?

USER: My depart day is 08/22 and return day is 08/24 with price limit 5000 and with single connection.

ASSISTANT: Please wait a minute, I will check the details and let you know the information.

USER: Ok.

ASSISTANT: Thank you for waiting. Sorry to say that we did not found any flight matching your requirements.

USER: That's ok, thanks for the information.

ASSISTANT: Thank you for choosing us.Have a nice day.