You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: Please help me to book a flight ticket from DFW to SFO.

ASSISTANT: Sure, let me know your travelling dates.

USER: My travel dates are from Jan, 03 to Jan, 05.

ASSISTANT: Please share your connection limit.

USER: I need  a single connecting flight.

ASSISTANT: Do you have any specifications?

USER: No.

ASSISTANT: May I know your name?

USER: William Anderson.

ASSISTANT: Sorry, there are no flights found based on your details.

USER: Thank you for your information.

ASSISTANT: Thank you for choosing us.