You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: Could you please book me a flight ticket from LAS to IAH?

ASSISTANT: Sure, can you please let me know your trip dates?

USER: I will start on July 28th and return on July 30th.

ASSISTANT: Do you have any connection limit preference?

USER: I am looking for a direct flight.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: Could you help me with your name please?

USER: I am Andrew Lopez.

ASSISTANT: Sorry, there is no direct flight available for the mentioned dates.

USER: That's alright, thanks for your assistance.

ASSISTANT: Thank you for reaching us.