You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: Please reserve a flight ticket from BOS to PHL for my business meeting.

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

USER: My departure is on Apr 04 and please book my return ticket on Apr 06.

ASSISTANT: Thank you, do you have any class preferences on your journey?

USER: Yes, I will prefer business class for my journey.

ASSISTANT: Ok, may I know your name for the documentation purpose?

USER: Sure, my name is Stephen Lewis.

ASSISTANT: Do you have any another preferences?

USER: I will prefer single connection for my journey, that's all my preferences.

ASSISTANT: Unfortunately, no flights available on your requirements.

USER: Oh! Sad to hear that. Anyway, I will find another alternative. Thank you for the information.

ASSISTANT: Welcome, thank you for reaching us.