You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: Lisa Young here. Can you please assist me in booking a flight ticket from LAS to HOU?

ASSISTANT: Sure, may I know your planned travel dates?

USER: My planned travel dates are Aug 12th and Aug 14th.

ASSISTANT: May I know your connection limit?

USER: I need a flight with single connection.

ASSISTANT: Do you have any other requirements?

USER: The depart time should be evening.

ASSISTANT: Sorry, there are no flights found with your given details.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for opting us.