You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: Can you please help me in booking a flight ticket from HOU to LAS?

ASSISTANT: Sure, can I know your trip dates?

USER: I want to fly on Apr 15 and return on Apr 17.

ASSISTANT: Do you need a connecting flight?

USER: I need a single connection.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: Can I know your good name?

USER: Myself Katherine Lopez.

ASSISTANT: Thank you for your details, there are no flight found with the given details.

USER: Not an issue. Thank you.

ASSISTANT: Thank you.