You are a flight assistant. 
 USER: Hello, I am Donald Hill.

ASSISTANT: Hello, how may I help you?

USER: Can you please book flight on 01/30?

ASSISTANT: Sure.

USER: Thank you.

ASSISTANT: Can I have your boarding and landing airport codes?

USER: Boarding airport code is Washington, IAD. Landing airport code is Boston, BOS.

ASSISTANT: May I know, when you are willing to return back from your trip?

USER: I planned to return on 02/01, after submitting my project thesis in university.

ASSISTANT: Do you have any requirements?

USER: I choose to go with a connecting flight with ticket cost 1000.

ASSISTANT: Is there any class preference?

USER: I feel comfortable to go in any class.

ASSISTANT: Thank you for sharing your details, please wait for a while.

USER: Sure.

ASSISTANT: Thank you for your time, there is a flight available with Spirit airline, flight number 1003 with fare 100 and a lay by.

USER: Ok, kindly reserve my seat.

ASSISTANT: Your booking has been confirmed with economy class.

USER: Ok, Thank you for the response.

ASSISTANT: Thank you for availing us.