You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you for today?

USER: Joseph Moore here. I am planning to visit Houston for a business meeting, can you please reserve a flight ticket from BOS to IAH?

ASSISTANT: I am here to help you about that Joseph Moore. Can you please provide your planned dates of journey?

USER: Thank you, my departure is on Jan 28 and please book my return ticket also on Jan 30.

ASSISTANT: Do you have any other requirements about your journey?

USER: I would like to departure in evening time.

ASSISTANT: Would you like to have a direct flight or a connecting flight for your journey?

USER: I will prefer single connection for my journey.

ASSISTANT: Do you have any class preference for your journey?

USER: No.

ASSISTANT: I regret to say this Joseph Moore, there are no flights as per your requirements.

USER: Oh! Sad to hear that. Anyway, thank you for the information.

ASSISTANT: You are welcome, thank you for reaching us.