You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, do you need any help from us?

USER: I want to fly from OAK to HOU. Can you help me in booking?

ASSISTANT: Sure, could you please share your departure and arrival day?

USER: My travelling dates are from Oct 7 to Oct 9.

ASSISTANT: Ok, could I have your name please?

USER: My name is Mark Phillips.

ASSISTANT: Ok, do you need direct or connecting flight?

USER: I need a connecting flight.

ASSISTANT: Ok, may I know your class preference?

USER: I prefer economy class.

ASSISTANT: Sorry, there is no flight with your request.

USER: Ok, No issues. Thank you.

ASSISTANT: You are welcome, have a great day.