You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

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

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: When did you scheduled to travel?

USER: My trip dates are from Jun 19th till Jun 21st.

ASSISTANT: Do you need any way station in your journey?

USER: I am looking for a direct flight.

ASSISTANT: Is there any class preference for you?

USER: I am ok with any class.

ASSISTANT: Do you have any other requirements?

USER: No, thanks.

ASSISTANT: Sorry to say, there are no flights available on your requested dates.

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

ASSISTANT: For references, may I know your name please?

USER: Myself Sarah Harris.

ASSISTANT: Thank you for reaching us.

USER: Thank you.