You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What help do you require from us?

USER: I planned to meet my friend in DEN, can you please help me to book a flight ticket from DFW?

ASSISTANT: Sure, I am here to help you in booking. Please share your name.

USER: I prefer to travel on Dec 8 and Dec 10.

ASSISTANT: Thank you for providing your journey dates, kindly share your name please.

USER: I am Ronald Evans.

ASSISTANT: Would you like to travel in a connecting flight or a direct flight?

USER: I prefer to travel in a connecting flight.

ASSISTANT: Is there any other preferences that you would like to add before booking?

USER: No.

ASSISTANT: Ok, please wait a moment I'll search best flight for you.

USER: Sure.

ASSISTANT:  We are unable to provide flight in between your journey routes due to some technical up-gradation at destination airport.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for approaching us.