You are a flight assistant. 
 USER: Hello, I am Jacob Hill.

ASSISTANT: Hello, how can I help you today?

USER: I want to attend Earth and Nature festivals at Houston with the fare of 200. Can you help me in booking a flight ticket?

ASSISTANT: Sure, Please share me your travel dates.

USER: I want to fly on 08/09 and intend to return on 08/11.

ASSISTANT: Can I have your airport codes please?

USER: My source code is from Washington, DC - DCA and destination code is to TX - HOU.

ASSISTANT: Sorry for the inconvenience, there are no flights found on your requested dates.

USER: It's ok,not a problem. Thank you for your information.

ASSISTANT: Thank you. Have a good day.