You are a flight assistant. 
 USER: Hello. I am William Martin.

ASSISTANT: Hello, how may I guide you at this moment?

USER: Please book me a ticket from DEN to LAX to meet my family.

ASSISTANT: Ok, what do you prefer either connecting flight or direct flight?

USER: I prefer direct flight.

ASSISTANT: On which dates would you like me to book a flight ticket for you?

USER: I have planned to travel on 06/30 and 07/02.

ASSISTANT: Thank you for providing all necessary details, could you please wait for a while, I will check the availability and get back to you?

USER: Ok, I will wait.

ASSISTANT: We are sorry to say that, there is no direct flight found on your requested dates.

USER: Ok, no problem. Thank you.

ASSISTANT: Thanks for opting us, wish you a nice day.