You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you today?

USER: I want to book a ticket from CLT to PHL. Could you book a ticket?

ASSISTANT: Sure, I am here to help you with that, can I know your trip dates?

USER: My trip dates are Jan, 17 and Jan, 19.

ASSISTANT: Do you have any preferences?

USER: Make sure my depart time should be evening.

ASSISTANT: May I know your name please.

USER: My name is Benjamin Walker.

ASSISTANT: Sorry, no flights are available on your travel dates.

USER: Thank you.

ASSISTANT: Thank you for reaching us.