You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Nicholas Taylor.

ASSISTANT: How can I help you today?

USER: I am looking for a flight from DFW to DEN, can you please help me in booking a flight ticket?

ASSISTANT: Sure, I am here to help you in booking process. Can you please help me with your travel dates?

USER: My travelling dates are Nov 29 and Dec 01.

ASSISTANT: Do you have any class preference?

USER: I am fine with any class.

ASSISTANT: May I know your departure time and return time?

USER: My departure time is afternoon.

ASSISTANT: DO you have any airline preference?

USER: I prefer normal cost airline.

ASSISTANT: Sorry, no flights are available on your preferable travel dates.

USER: That's ok, thank you for checking.

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