You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I am Melissa Walker here. Could you please help me with booking a flight ticket from BOS to LAX?

ASSISTANT: Sure, may I know your travel dates please?

USER: My planned travel dates are Feb 19 and Feb 21.

ASSISTANT: Do you have any specifications?

USER: I need a halt in between my journey and my return time should be in Afternoon.

ASSISTANT: Sorry, there are no flights in this route as per your travelling details.

USER: Ok, no problem. Thank you for your kind information.

ASSISTANT: Thank you for reaching us.