You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Jonathan Lee. Please book me a ticket from DCA to CLT to meet my family.

ASSISTANT: Sure, when are you planning to make your trip?

USER: I have planned to travel on Jan 18th and return  on Jan 20th.

ASSISTANT: At what time would you like to depart and return?

USER: I would like to return at afternoon time.

ASSISTANT: How many connections do you need?

USER: I prefer connecting flight.

ASSISTANT: Do you need any economy class or business class?

USER: I am ok with any class.

ASSISTANT: Ok, please wait.

USER: Ok, I will wait.

ASSISTANT: There is a Southwest airline with flight number 1016 going on your way with airfare of 100 and the return time is afternoon. Is that fine?

USER: Ok, please book this ticket.

ASSISTANT: Your booking has been confirmed.

USER: Thank you for your kind help.

ASSISTANT: Thank you for choosing us.