You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Daniel King.

ASSISTANT: How can I assist you today?

USER: I am planning to visit Golden Gate Park at San Francisco, could you please help me with booking a flight ticket from DFW to SFO?

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

USER: I would like to take off on 12/15 and return on 12/17.

ASSISTANT: Let me check for the availability of flight.

USER: Sure, take your time.

ASSISTANT: Daniel, there is no flight available at your requested dates.

USER: That's ok, I will find an another alternate way to complete my trip. Anyways, thank you for the information.

ASSISTANT: Thank you for contacting us.