You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: Please can you help me out with the flight ticket booking from DFW to DEN?

ASSISTANT: Sure, I am here to help you. Can you please provide your journey dates?

USER: Ok, please book for the dates Mar 24 and 26 respectively.

ASSISTANT: Do you have any connection limit preference for this trip?

USER: I need a connecting flight.

ASSISTANT: May I know your class preference for this trip?

USER: Any flight class is fine.

ASSISTANT: Do you have any other specifications for this trip?

USER: Yes, I need a flight which depart during afternoon.

ASSISTANT: May I know your good name please?

USER: My name is Pamela Hernandez.

ASSISTANT: Pamela Hernandez, we regret to inform you that there are no flight services are available on this route with your preferences.

USER: That is ok, thank you for assisting me.

ASSISTANT: Thank you for contacting us.