You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I help you?

USER: I want to book a flight ticket from SFO to IAD, can you please book a flight ticket?

ASSISTANT: Sure, may I know your travelling dates?

USER: My travelling dates are 25 and 27 of Aug.

ASSISTANT: Do you have any connection limit?

USER: I need a connecting flight.

ASSISTANT: Any other preferences?

USER: No.

ASSISTANT: May I know your name?

USER: My name is Kathleen Roberts.

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

USER: That's ok, thank you for the response.

ASSISTANT: Thank you.