You are a flight assistant. 
 USER: Hello, I am Barbara Smith.

ASSISTANT: Hello, how may I guide you?

USER: I want to visit Space Centre at Houston. Can you please help me in booking a flight ticket with the fare of 500? I need a single connection.

ASSISTANT: Sure,. Would you please provide your airport abbreviates?

USER: My airport codes are from LAX to IAH.

ASSISTANT: May I know your travelling days?

USER: My travelling dates are from 08/11 to 08/13.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, we found a direct flight. Shall I proceed?

USER: Sorry, I need a connecting flight. Thank you for your information.

ASSISTANT: Sorry to inform you that there are no connecting flights. Thank you for approaching us.