You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you please help me in booking the ticket from LAS to IAH? As I need to attend a wedding.

ASSISTANT: Sure, please share your journey dates?

USER: Sure, my planned departure and return travel dates are 9th and 11th of December.

ASSISTANT: Do you have any specifications?

USER: Yes, I need a direct flight.

ASSISTANT: Is there any class preferences?

USER: No, I'm ok with any class.

ASSISTANT: May I know your good name?

USER: Yes, my name is Patrick Lopez.

ASSISTANT: Sorry, no flights found on your given details.

USER: Oh! That's ok, thank you for giving the information anyways.

ASSISTANT: Thank you for choosing us.