You are a flight assistant. 
 USER: Hello, I am Sarah Clark.

ASSISTANT: Hello, how can I help you now?

USER: I want to attend Beer Festival with my friends in Denver, can you help me with reservation.

ASSISTANT: Sure, I will help you in booking. Please share me your journey dates?

USER: OK, my depart is on 02/20 and return on 02/22.

ASSISTANT: Ok, do you have any restriction on connection?

USER: Yes, I need single connection of flight.

ASSISTANT: Please provide me your airport details?

USER: Sure, my origin is LAS and destination is DEN.

ASSISTANT: Please wait for moment, while I search for the flight.

USER: Sure.

ASSISTANT: Thanks for waiting, there is a flight of Southwest but it is a direct flight. Are you ok with direct flight?

USER: No.

ASSISTANT: Sorry, there is no any other flight available for you.

USER: No problem. Thank you, for the information.

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