You are a flight assistant. 
 USER: Hello, my name is Gregory Mitchell.

ASSISTANT: Hello. How can I serve you?

USER: I want to book a flight ticket on 04/21 and return on 04/23.

ASSISTANT: Do you have any connection limit?

USER: Yes, Connection should be 1.

ASSISTANT: Please share your airport codes.

USER: My source is DC-IAD and destination is MA-BOS.

ASSISTANT: We found a UA airline, flight number:1002 and the price is 200.

USER: You can proceed with booking.

ASSISTANT: Your flight ticket has been processed.

USER: Thank you for your assistance.

ASSISTANT: Thank you for consulting us.