You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

USER: Christopher Gonzalez here. I want to book a flight ticket from LGA to DFW. Can you help me in that?

ASSISTANT: Sure, can you please share your travel dates?

USER: My trip dates are Jan 06 to Jan 08.

ASSISTANT: Do you have any class preference?

USER: No.

ASSISTANT: May I know your connection limit?

USER: I need a connecting flight.

ASSISTANT: Do you have any other specification that you are looking for?

USER: My depart time should be in the afternoon.

ASSISTANT: Let me check for the availability of flight.

USER: Ok.

ASSISTANT: Christopher Gonzalez, I am sorry to inform you that there is no flight available at your request.

USER: Ok, no problem. Thank you.

ASSISTANT: You are welcome. Thank you for contacting us.