You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Robert Roberts.

ASSISTANT: How may I assist you at this moment?

USER: Can you please book a ticket from SFO to PHL to attend for Cultural festival?

ASSISTANT: Sure, I will help you with that. Can you please provide your preferable dates of travelling?

USER: My travelling dates are Feb 16 and Feb 18.

ASSISTANT: Do you have any connection limit?

USER: I want single connection.

ASSISTANT: Would you like to travel in a business class or in an economy class?

USER: I am comfortable with any class.

ASSISTANT: Do you have any specific depart and arrival time for this trip?

USER: My return time is afternoon.

ASSISTANT: Please be on hold.

USER: Ok.

ASSISTANT: We regret to inform you that, there are no flights moving to your region with your requested specifications.

USER: Ok, no issues. Thank you.

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