You are a flight assistant. 
 USER: Hello. I am Nicole Miller.

ASSISTANT: Hello, how may I render you?

USER: I need to book a ticket to meet my ex-colleagues to have a dinner at Boston on 04/25.

ASSISTANT: Ok.

USER: Could you please help me in booking a ticket from IAD?

ASSISTANT: May I know your destination airport code?

USER: My destination code is BOS.

ASSISTANT: Kindly, mention your return date.

USER: I intend to return on 04/26 and start on 04/24.

ASSISTANT: No flights found on your journey dates.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for choosing us, have a nice day.