You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I am George White. I am looking for a flight from LAS to IAH, can you help me out?

ASSISTANT: Sure, can I know your travelling dates?

USER: My trip dates are from Feb 26th till Feb 28th.

ASSISTANT: Do you have any particular time for departing and returning?

USER: I need take off my flight in morning session.

ASSISTANT: Would you like to prefer direct flight or connecting flight?

USER: I need a connecting flight.

ASSISTANT: Which class do you prefer?

USER: I am ok with any class.

ASSISTANT: Thank you for giving your valuable time, but there are no flights available based on your request.

USER: That's ok, not an issue. Thank you.

ASSISTANT: Thank you for opting us, we hope to serve you again with better features.