You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How may I help you?

USER: I am planning to travel from LAX to attend a seminar on laser treatment on 09/14, is there any flight available for me to travel?

ASSISTANT: Surely, I will check the details.

USER: Thank you.

ASSISTANT: May I know the destination code and return date?

USER: Yes, I will return from DEN which is my destination and the return trip on 09/16.

ASSISTANT: May I know your name?

USER: Sure, my name is Debra Wilson.

ASSISTANT: Please give a minute.

USER: Sure.

ASSISTANT: Sorry, No flights found with your chosen dates.

USER: Ok, no problem, thank you for your help.

ASSISTANT: Thank you for opting us.

USER: Welcome.