You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you today?

USER: I am planning to visit Houston and I would like to depart in the evening time. Can you book the flight ticket?

ASSISTANT: Sure, may I know your travelling airport code?

USER: The airport code are from LAS to HOU.

ASSISTANT: Let me know your trip dates?

USER: My travel dates are from Mar 25 to Mar 27.

ASSISTANT: Do you have any connection limit?

USER: I am looking for a single connecting flight.

ASSISTANT: Is there any other specifications?

USER: No.

ASSISTANT: May I know your good name.

USER: I am Kimberly Jones.

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

USER: Not a problem. Thank you.

ASSISTANT: Thank you for reaching us.