You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you for the day?

USER: I want to attend office seminar, can you book my ticket from IAH to DEN?

ASSISTANT: Sure, can you please let me know your journey dates?

USER: My planned travel dates are 06/25 and 06/27.

ASSISTANT: Is there any class preference?

USER: No issues with class but I want a flight with maximum connection of 1. No more, specifications please.

ASSISTANT: Ok, may I know your name please?

USER: Sure, Robert Hernandez here.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry there are no flights are available matching your preferences.

USER: No issues, thank you for the information.

ASSISTANT: Thank you for choosing our services.