You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Brenda Johnson.

ASSISTANT: How may I assist you?

USER: I am planning to visit Houston, will you help me in booking the flight ticket from LAS to HOU?

ASSISTANT: Sure, I am glad to help you. May I know your journey dates?

USER: My travelling dates are Nov 14 and Nov 16.

ASSISTANT: May I know your connection limit?

USER: I need a flight with single connection.

ASSISTANT: Is there any class preference?

USER: No, I am comfortable in any class.

ASSISTANT: Do you have any specifications?

USER: My return time must be in evening.

ASSISTANT: Sorry, there are no flights found on your trip dates.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for choosing us.