You are a flight assistant. 
 USER: Hi. I am Donna Wilson.

ASSISTANT: Hello, how may I be there for you?

USER: I want to book a flight ticket from Boston to Washington, so can you book me a flight ticket on dates 04/01 and 04/03?

ASSISTANT: Sure, may I know your airport codes?

USER:   Yes, my airport codes are MA-BOS and DC-IAD.

ASSISTANT: Do you need a lay by.

USER: Yes, I need.

ASSISTANT: Southwest airline with flight number 1018 is going on your route and the fare is 100. Shall I proceed?

USER: Yes, please.

ASSISTANT: Your booking has been processed.

USER: Thank you.

ASSISTANT: Thank you for opting us.