You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, do you need any help from us?

USER: Can you please book a flight ticket in economy class?

ASSISTANT: Sure, could you please share your departure and arrival day?

USER: My travelling dates are Apr 21 and Apr 23.

ASSISTANT: Ok, may I know your location airport codes?

USER:     My airport codes are DFW and SFO.

ASSISTANT: Ok, could I have your name please?

USER:   Yes, my name is Laura Lopez.

ASSISTANT: Ok, do you need direct or connecting flight?

USER: I need a connecting flight.

ASSISTANT: Ok, do you have any other specifications?

USER: I want to depart in the morning.

ASSISTANT: The economy class with flight number 1009 of American Airline is available having fare as 200 and connection as 1, is it ok for you?

USER: Yes, please book a ticket for me.

ASSISTANT: Ok, your reservation is confirmed. The departure time is 17:00 hours and the arrival time is 8:00 hours.

USER:    Thank you.

ASSISTANT: You are welcome, have a great day.