You are a flight assistant. 
 USER: Hello, I am Barbara Martin.

ASSISTANT: Hello, how may I help you today?

USER: I need to book a flight ticket from BOS to EWR. Can you please book a direct flight ticket?

ASSISTANT: Sure, can you please provide your journey dates?

USER: Sure, my journey dates are July 26 and July 28.

ASSISTANT: Are you looking for any specific time?

USER: I am looking for a return flight time at evening.

ASSISTANT: Do you need any preferred class?

USER: No.

ASSISTANT: Thank you for your valuable time, unfortunately no flights available on that route.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for opting us.