You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I guide you?

USER: I have a program to attend, so could you help me to book a  ticket from LGA to LAS.

ASSISTANT: Sure, I am willing to help you for this. When would you like to travel?

USER: My travel dates are June 19 and June 21.

ASSISTANT: Is there any other specifications regarding your journey?

USER: Yes, I would like to board a direct flight with the economy class.

ASSISTANT: Do you have any preference?

USER: No. Thank you for asking.

ASSISTANT: For further process. May I know your name please?

USER: My name is Scott Davis.

ASSISTANT: sorry to inform, no flights are found with your criteria.

USER: No issue, thank you for your time.

ASSISTANT: Thank you very much for contacting our agency.