You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I serve you?

USER: Please help me to book a flight ticket from IAH to LAS.

ASSISTANT: Sure, may I know the travelling dates?

USER: My trip dates are 05 to 07 of Sep.

ASSISTANT: Do you have any connection limit?

USER: I need a connecting flight.

ASSISTANT: Is there any other requirements?

USER: No.

ASSISTANT: May I know your name?

USER: I am Stephanie White.

ASSISTANT: Sorry, no flights found with your chosen dates.

USER: It's ok, not a problem, thank you.

ASSISTANT: Thank you for opting us.