You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you today?

USER: Can you help me in booking my flight ticket from IAD to OAK?

ASSISTANT: Sure, let me know your travelling dates.

USER: My trip dates will be Apr 30th to May 2nd.

ASSISTANT: May I know your connection limit?

USER: I prefer a connecting flight.

ASSISTANT: Do you have any other requirements?

USER: No, thanks.

ASSISTANT: May I know your name please?

USER: Linda Harris here.

ASSISTANT: Sorry, there are no flights found with your given details.

USER: That's ok, thank you.

ASSISTANT: Thank you for opting us.