You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I would like to book a ticket from LAX to IAH.

ASSISTANT: Sure, may I know the travelling dates?

USER: Travelling dates are Sept, 10 and Sept, 12.

ASSISTANT: Do you have any connection limit?

USER: I would prefer connecting flight.

ASSISTANT: Are there any other requirements?

USER: I would like to return in the evening.

ASSISTANT: May I know your name?

USER: I am Raymond Robinson.

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

USER: Thank you.

ASSISTANT: Thank you for opting us.