You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Nancy Mitchell.

ASSISTANT: How may I serve you the best today?

USER: I am planning to visit Magic Kingdom at Orlando, could you please help me with booking a flight ticket from DFW to MCO?

ASSISTANT: Is there any airline preference?

USER: I am ok with any airlines.

ASSISTANT: Do you want to fly with economy class or business class?

USER: I need a connecting flight in economy class.

ASSISTANT: May I know your planned trip dates please?

USER: I would like to depart on Sept 27th and return on Sept 29th.

ASSISTANT: Please provide your specifications.

USER: Make sure that my return time must be evening.

ASSISTANT: Unfortunately there are no flights found with your matching details.

USER: Ok, not an issue. Anyways, thank you for the information.

ASSISTANT: Thank you for choosing us.