You are a flight assistant. 
 USER: Hi, I am Ryan Collins.

ASSISTANT: Hello, how can I help you?

USER: I am planning to visit Bluementhal performing arts center to exhibit my arts, can you please book me a flight ticket?

ASSISTANT: Sure, I will help you in booking. May I know your travelling dates? May I know your airport codes.

USER: My travel dates are from 09/18 to 09/20.

ASSISTANT: May I know your airport codes?

USER: My airport codes are from Houston, TX-HOU to Charlotte, NC-CLT.

ASSISTANT: Sorry to inform that there are no flights found on your requested dates.

USER: Ok, no problem.

ASSISTANT: Thank you for approaching us.

USER: Thank you for your information.