You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Gregory Baker.

ASSISTANT: How may I aid you today?

USER: Can you help me in booking from LAS to BOS?

ASSISTANT: Sure, I am glad to help you with that. Can you please mention your travelling dates?

USER: My travelling dates are from Jan 1 to Jan 3.

ASSISTANT: At what time are you planning to depart and return?

USER: My return time is afternoon.

ASSISTANT: Do you have any connection limit?

USER: I need a connecting flight.

ASSISTANT: Any class preference do you have?

USER: No.

ASSISTANT: Please be on hold to check the flights.

USER: Sure.

ASSISTANT: We regret to inform you that, there are no flights found on your route with your required specifications.

USER: Ok, No issues. Thank you.

ASSISTANT: Thank you for reaching us, have a great day.