You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you today?

USER: Can you please book a flight ticket from IAH to LAS?

ASSISTANT: Sure, kindly share your travel dates.

USER: My travelling dates are Sept 03 and Sept 05.

ASSISTANT: Do you have any connection limit?

USER: I need a direct flight.

ASSISTANT: Is there any other specifications?

USER: I prefer normal cost airlines.

ASSISTANT: Please share your name.

USER: My name is Jonathan Green.

ASSISTANT: Ok, please wait a moment.

USER:    Ok.

ASSISTANT: Sorry to say, no flights found with your requirement.

USER:  That's ok, thank you for the response.

ASSISTANT: Thanks for reaching us.