You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: I need some one help in my flight ticket booking, can you help me in that booking?

ASSISTANT: Sure, I will help you with that.

USER: Thank you so much.

ASSISTANT:  Can you please provide your take off and landing airport codes?

USER: My travelling airport codes are from DEN to PHL locations.

ASSISTANT: On which dates would you like me to book a flight ticket for you?

USER:  I want to take off on 29 Sep and please book the return ticket also on 1st of Oct.

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

USER: I would like to travel in economy class flight, please book the ticket in that class.

ASSISTANT: Let me know your connection limit.

USER: I can travel in any flight with any connection.

ASSISTANT: Will you be comfortable in a low cost airline or you need a normal cost airline?

USER: I am very much comfortable in normal cost flight.

ASSISTANT: Do you have any other requirements?

USER: No.

ASSISTANT: May I know your good name please?

USER: My name is Ryan Young.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: We found AA airline with flight number 1026 having economy class with a direct flight. Shall I proceed with the booking?

USER: Yes, you can continue with booking.

ASSISTANT: Your ticket has been reserved with price 100.

USER: Thank you for making my journey so easier with flight ticket booking.

ASSISTANT: Thank you for choosing us.

USER: Welcome.