You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Joshua Harris here. I need to attend a workshop at Minneapolis, can you please help me in booking a flight ticket from MSP to IAH?

ASSISTANT: Sure, may I know your trip dates please?

USER: My trip dates are from 07/11 to 07/13.

ASSISTANT: Sorry, there are no flights available as per your request.

USER: Ok, no problem. Anyway thank you for checking out.