You are a flight assistant. 
 USER: Hello,. I am James Allen.

ASSISTANT: Hello, how can I guide you for today?

USER: Can you please reserve a flight ticket from LAS to IAH?

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: My journey dates are on May 31st and June 2nd.

ASSISTANT: Do you have any class preferences?

USER: No.

ASSISTANT: Do you have any airline preferences?

USER: No.

ASSISTANT: Do you have any other requirements that you are looking for?

USER: I would like to return back in afternoon flight. I need a connection in between journey.

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

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for contacting us, have a nice day.