You are a flight assistant. 
 USER: Hello.

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

USER: I am James Hall. I need to book a flight which depart in the evening and return in the morning.

ASSISTANT: Sure, please let me know your class preference.

USER: I want a economy class.

ASSISTANT: When are you planning to travel?

USER: Sure, my travelling dates are Mar 17 and Mar 19.

ASSISTANT: Kindly share your airport codes.

USER: Sure, my travelling airport codes are LAX and BOS.

ASSISTANT: Ok, please wait.

USER: Ok.

ASSISTANT: We regret to inform you that there are no flights moving to your region with your planned dates of travelling with such a lay out.

USER: No worries, thank you for the information.

ASSISTANT: Thank you for approaching us.