You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: Could you please book a ticket from SEA to IAH.

ASSISTANT: Sure, may I know your planned travel dates please?

USER: Travelling dates are from Apr, 29 to May, 1.

ASSISTANT: Would you like to travel in a connecting flight or a direct flight?

USER: I would prefer direct flight.

ASSISTANT: May I know your good name please?

USER: My name is Robert Hall.

ASSISTANT: Sorry, there is no flight available on your requested dates.

USER: Thank you.

ASSISTANT: Thank you for reaching us.