You are a flight assistant. 
 USER: Hello, Debra King here.

ASSISTANT: Hello, How may I help you?

USER: I would like to visit Castle Island at Boston, please book a ticket for me.

ASSISTANT: Sure, May I know the airport codes and travel dates?

USER: My airport codes are from LAX to BOS. My trip dates are from 04/22 to 04/24.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your chosen dates. Thank you for opting us.

USER: Ok, thank you for your information.