You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: I would like to meet my sister at New York, can you please reserve flight ticket from OAK to EWR?

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

USER: My planned travelling dates are May, 09 and 11 respectively.

ASSISTANT: Do you have any particular time for departing and returning?

USER: I am comfortable to travel in any time.

ASSISTANT: May I know your good name please?

USER: Sure, my name is Ruth Martinez here.

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

USER: I would prefer to direct flight to travel.

ASSISTANT: Do you have any class preference?

USER: No, thank you for asking.

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

USER: It's ok, thank you for your information.

ASSISTANT: Thank you for approaching us.