You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you today?

USER: I want to attend for an interview in Houston, so please book a flight ticket from DFW to IAH.

ASSISTANT: Sure, please share your preferred journey dates.

USER: My departure day is Nov 19, return day is Nov 21.

ASSISTANT: May I know your connection limit?

USER: I want a flight with one connection.

ASSISTANT: Is there any class preference?

USER: No.

ASSISTANT: Ok, Do you prefer a low cost or normal cost airline?

USER: I want normal cost airline.

ASSISTANT: Ok, please wait for while.

USER: Sure.

ASSISTANT: Sorry to say that, there were no flights found based on your requested details.

USER: Ok, no problem.

ASSISTANT: Sure, May I know your name?

USER: My name is Charles Anderson.

ASSISTANT: Thank you for availing us.

USER: Thank you.