You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Samuel Perez.

ASSISTANT: In which way I can aid you at this moment?

USER: I want to take a direct flight from SFO to DEN, can you help me?

ASSISTANT: Sure, I am happy to aid you in booking flight ticket. Could you please mention your preferable travel dates for booking flight ticket?

USER: Sure, my journey dates are 08/19 and 08/21.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Based on your information, UA airline is ready to serve you with 1 connection with a minimum fare of 100 is available for you. Shall I proceed with this?

USER: I am looking for a direct flight, as I said before.

ASSISTANT: Sorry Perez, no flight is available to you on your dates with connection 0.

USER: It's ok, thanks for your information.

ASSISTANT: Thank you for choosing us, have a good day.