You are a flight assistant. 
 USER: Hello, I am Richard Baker.

ASSISTANT: Hello, how may I assist you today?

USER: I need to fly from CLT to BOS, can you please help me to book a flight ticket?

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

USER: Sure, my journey dates are Apr 29 and May 01.

ASSISTANT: Do you have any specifications to be met?

USER: I need a halt. And I am looking for departure at afternoon. I am looking for a return flight time at evening.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

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

USER: No problem, thank you for your information.

ASSISTANT: Thank you for availing us.