You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I planned to meet my friend in SFO, can you please help me to book a flight ticket from DEN?

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

USER: I prefer to travel on Apr 11 and Apr 13.

ASSISTANT: May I know your connection limit?

USER: I prefer to travel in a connecting flight.

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

USER: No.

ASSISTANT: May I know your name to proceed further?

USER: I am Brandon Davis.

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

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for contacting us.