You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you?

USER: I want to book a flight ticket from DEN to IAD. Can you help me in that?

ASSISTANT: Sure, I am here to help you for this. when you are planning to depart and return?

USER: I don't have any particular timings.

ASSISTANT: Could you please share me your travel dates?

USER: My trip dates are Oct 27 to Oct 29.

ASSISTANT: Do you have any preference regarding your journey?

USER: I need to travel in business class.

ASSISTANT: Is there any other requirements?

USER: I need a connecting flight.

ASSISTANT: For further process. May I know your name please?

USER: Myself Scott Hall.

ASSISTANT: Sorry for inconvenience, no flights are found with your credentials.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you very much for contacting our agency.