You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I be of your helping hand today?

USER: I am planning to book a ticket from DEN to LAS to attend seminar, can you help me in booking?

ASSISTANT: Sure, we will help you in booking. Can you please provide your journey dates?

USER: I am departing on Apr 15 and return on Apr 17.

ASSISTANT: Do you prefer business or economy class in your journey?

USER: I am ok with any class.

ASSISTANT: In which airlines would you like to book your flight ticket?

USER: I want  a flight with normal-cost airline.

ASSISTANT: Do you prefer any way station in between journey?

USER: I need a flight with connection limit 1.

ASSISTANT: Is there any more specifications?

USER: I want to return in afternoon time.

ASSISTANT: May I know your good name please?

USER: My name is Pamela Walker.

ASSISTANT: Thank you for your details, please wait for a while.

USER: Sure, take your time.

ASSISTANT: Sorry to inform you that, we did not find any flights matching your requirements.

USER: That's ok, thank you for your information.

ASSISTANT: Thank you for choosing our services.