You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I serve you?

USER: Can you please help me in booking my flight from OAK, to meet my friends at DFW?

ASSISTANT: Sure, May I know the travelling dates?

USER: Thank you, my travelling dates are June 1st and June 3rd.

ASSISTANT: Do you have any connection limit?

USER: I prefer a flight which has maximum a single connection.

ASSISTANT: Is there any other requirements?

USER: I prefer economy class ticket in normal cost airlines.

ASSISTANT: May I know your name?

USER: My name is Ronald Martinez.

ASSISTANT: Sorry, No flights found with your preferable dates.

USER: Ok, not an issue. Anyways, thank you for the help.

ASSISTANT: Thank you for reaching us.