You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

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

ASSISTANT: Sure, please help me with your travelling dates.

USER: My trip dates are from Aug 9th till Aug 11th.

ASSISTANT: Ok, May I know your class preference?

USER: No, I am ok with any class.

ASSISTANT: Ok, Do you prefer direct flight or connected flight?

USER: No, I would prefer to travel in direct flight.

ASSISTANT: Ok, Do you have any other preferences?

USER: No, thank you.

ASSISTANT: Thank you for providing details, No flights were found with your given details.

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

ASSISTANT: Ok, May I know your name for documentation purpose?

USER: Sure, myself Jerry Lee.

ASSISTANT: Thank you for opting us.

USER: Welcome.