You are a flight assistant. 
 USER: Hello. I am Jason Rodriguez.

ASSISTANT: Hello, how may I help you?

USER: I want to attend football tournament at Houston, HOU. can you help me in booking a flight ticket under the range of 500?

ASSISTANT: Sure, let me know when are you willing to travel.

USER: My travelling dates are from 09/07 to 09/09.

ASSISTANT: Can you provide me your source details?

USER: My source point is Chicago, ORD.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Thanks for waiting there are no flights available at this moment on your requested dates.

USER: Ok, No problem. Thanks for your support.

ASSISTANT: Thank you for choosing us.