You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I would like to book a flight ticket from CLT to LAS to meet my parents. Could you please help me with booking a flight ticket?

ASSISTANT: Sure, I can help you with that. May I know your travel dates please?

USER: My travelling dates are Sep 10 and Sep 12.

ASSISTANT: May I know your class and airline preference please?

USER: I am comfortable with nay class and airline preference.

ASSISTANT: Please let me know if you have any other specifications.

USER: I want to return in the evening.

ASSISTANT: Can I have your good name please?

USER: I am Patrick Perez.

ASSISTANT: Sorry, there are no flights on that route with your given details.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for choosing us.