You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I render you?

USER: Can you help me in booking a flight ticket from IAD to DEN?

ASSISTANT: Sure, please provide your itinerary dates.

USER: I want to travel on 09/01, and return on 09/03.

ASSISTANT: May I know your name?

USER: I am Jeffrey Phillips.

ASSISTANT: Do you prefer to travel in economy or business class?

USER: I am comfortable with any class.

ASSISTANT: Do you prefer a direct or connecting flight?

USER: I need a break in my journey.

ASSISTANT: At what time do you want to depart and return?

USER: I am comfortable with any time.

ASSISTANT: In which airlines do you prefer to travel?

USER: I prefer for normal cost airline.

ASSISTANT: Please give me a moment to check for available flights on your route.

USER: Sure.

ASSISTANT: Sorry Jeffrey Phillips, we could not find any flight with normal-cost airlines.

USER: Ok, no problem. Thanks for the information.

ASSISTANT: Thank you for approaching us.