You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you for the day?

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

ASSISTANT: When you are willing to travel?

USER: Travel dates are Jan, 26 and Jan, 28.

ASSISTANT: Let me know your connection limit?

USER: I prefer connecting flight.

ASSISTANT: Do you have any other requirements?

USER: I would like to return in the evening.

ASSISTANT: may, I know your good name?

USER: My name is Karen Collins.

ASSISTANT: Sorry, we found no flights on your given dates.

USER: Thank you.

ASSISTANT: Thank you for reaching us.