You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: Can you reserve me a ticket from BOS to PHL?

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

USER: My trip dates are June 15 to 17.

ASSISTANT: Do you have any limits on number of connections?

USER: I need a direct flight.

ASSISTANT: Do you have any another specifications on your journey?

USER: Please ensure that my return time is in evening.

ASSISTANT: May I know your name for the booking?

USER: I am Kevin Walker.

ASSISTANT: Sorry, no flights are available on your required dates.

USER: Ok, no issues. Thank you for the information.

ASSISTANT: Welcome, thank you for reaching us.