You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you?

USER: Please help me in booking flight ticket from DFW to SFO to attend an event.

ASSISTANT: Yes, can you tell me your dates of travel?

USER: My trip dates are July 03 to July 05.

ASSISTANT: Do you have any preferences?

USER: I prefer to travel in connecting flight.

ASSISTANT: Give me a moment.

USER: Ok.

ASSISTANT: Sorry to inform you that there are no flights found on your requested dates.

USER: Ok, no problem. Thank you.

ASSISTANT: Can I know your name?

USER: Paul Martin.

ASSISTANT: Thank you for contacting us.

USER: Sorry, Paul Martinez.

ASSISTANT: Thank you for your details.