You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Can you help me in finding a best flight from SEA?

ASSISTANT: Yes, can you tell me your travelling dates?

USER: My trip dates will be Feb 3rd to Feb 5th.

ASSISTANT: Can you tell me your destination airport code?

USER: My landing airport code is DCA.

ASSISTANT: Do you have any preferences?

USER: My return time is in the evening.

ASSISTANT: Do you have any specifications?

USER: I need a economy class flight.

ASSISTANT: Give me a moment.

USER: Sure, make sure that the flight should be in a normal cost.

ASSISTANT: Ok. I have found an economy class ticket with 1 connecting flight.

USER: You can proceed.

ASSISTANT: Your ticket has been booked.

USER: May I know the flight details?

ASSISTANT: Can I know your name for booking?

USER: I am Sharon Baker.

ASSISTANT: Flight number is 1007 of AA airlines.

USER: Thank you.

ASSISTANT: Welcome.