You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I would like to book a ticket from MCO to LAS.

ASSISTANT: Sure, we are glad to help you. Can I have your travelling dates?

USER: Departure is on May, 18 and return date is May, 20.

ASSISTANT: Do you prefer any break in between journey?

USER: I would be comfortable with single stop over.

ASSISTANT: Are there any other specifications for you?

USER: I would like to depart in the evening and would like to return in the evening.

ASSISTANT: May I know your good name?

USER: My name is Charles Carter.

ASSISTANT: Sorry, no flights are available on your journey routes.

USER: Thank you.

ASSISTANT: Thank you for choosing us.