You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: Can you please help me to book a flight from SFO to DCA?

ASSISTANT: Sure, let me know your travelling dates.

USER: My travel dates are Feb 18th and 20th.

ASSISTANT: Do you want connecting flight or direct flight?

USER: I am fine with any of it.

ASSISTANT: Is there any class preference?

USER: No, I don't have.

ASSISTANT: Do you have any other specifications?

USER: No.

ASSISTANT: May I know your name?

USER: My name is Angela Wright.

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

USER: No worries, thank you.

ASSISTANT: Thank you for choosing us.