You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Helen Lewis here.

ASSISTANT: How may I assist you at this moment?

USER: Can you please help me in booking a flight ticket from LGA to ATL?

ASSISTANT: Sure, I will help you with that. Can you please provide your preferable departure and return dates of travelling?

USER: Sure, my travel dates are from Apr 11 to Apr 13.

ASSISTANT: Is there any specific timings in your departure and arrival?

USER: I would like return in afternoon.

ASSISTANT: Do you have any class preference?

USER: I prefer business class.

ASSISTANT: Any connection limit do you have?

USER: I need a connecting flight.

ASSISTANT: Please be on hold to check the flights.

USER: Ok, please make sure that my airline preference must be in normal cost.

ASSISTANT: Unfortunately there are no flights running on your route with your required preferences.

USER: Ok, no problem. Thank you for the information.

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