You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I need to buy a plane ticket from DEN to ORD. Please help me in that.

ASSISTANT: Sure, may I know your planned travel dates please?

USER: My journey dates are from May, 21 to May, 23.

ASSISTANT: Would you like to travel in a connecting flight or a direct flight?

USER: I do not have any specifications. Please book my ticket quickly.

ASSISTANT: May I know your good name please?

USER: Emma Baker.

ASSISTANT: We found American airline with economy class and flight number is 1018 with arrival time is 20:00 hours and depart time is 6:00 hours.Shall I proceed for booking?

USER: Please proceed.

ASSISTANT: Your ticket is booked.

USER: Thank you.

ASSISTANT: You are welcome.