You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I would like to travel from HOU to IAH to meet my uncle. Can you please book my ticket?

ASSISTANT: Please provide me the departure and arrival dates.

USER: My travel dates are from 04/25 to 04/27.

ASSISTANT: Is there any connection limit?

USER: I want a direct flight.

ASSISTANT: May I know if there is any class specification.

USER: My class preference is business class.

ASSISTANT: Are there any more preferences?

USER: No.

ASSISTANT: May I know your name please?

USER: Myself Karen Young.

ASSISTANT: Give me a moment.

USER: Ok.

ASSISTANT: Karen Young, sorry to inform that there are no flights on your travel dates.

USER: It's ok, thank you.

ASSISTANT: Thank you for reaching us.