You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Shirley Hall. Could you please book a flight ticket from LAX to BOS?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Can you share me your journey dates?

USER: My journey dates are Aug 16 and Aug 18.

ASSISTANT: Do you prefer any way station in your journey?

USER: No, I need a direct flight in between my journey.

ASSISTANT: May I know your depart time and arrival time?

USER: I want to return in the evening.

ASSISTANT: Do you have any other preferences?

USER: No, thanks for asking.

ASSISTANT: Sorry to inform you that, there are no flights available with your requirements.

USER: Not a problem, thank you for the information.

ASSISTANT: Thank you for reaching us.