You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Can you please help me to book a flight from LAS to IAH?

ASSISTANT: Sure, may I know your trip dates?

USER: Sure, I want to depart on June 12 and need to return on June 14.

ASSISTANT: Do you have any connection limit?

USER: I am looking for a flight with single connection.

ASSISTANT: Is there any other specifications?

USER: My depart time must be in the evening.

ASSISTANT: May I know your good name?

USER: Donald Turner here.

ASSISTANT: Sorry, no flights are available in this route as per your requested dates.

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

ASSISTANT: Thank you for reaching us.