You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I want to travel from SFO to BOS. Can you help me to book a flight ticket?

ASSISTANT: Sure, please share your journey dates?

USER: I want to travel in the flight on Mar 09 and Mar 11.

ASSISTANT: Do you have any specifications?

USER: I am looking for a direct flight.

ASSISTANT: Is there any class preferences?

USER: No.

ASSISTANT: May I know your good name?

USER: Stephanie Allen.

ASSISTANT: Sorry, no flights found on your given details.

USER: That's ok. Anyways, thank you.

ASSISTANT: Thank you for choosing us.