You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you today?

USER: Can you please help me to book a flight from OAK to BOS?

ASSISTANT: Sure, let me know your journey dates.

USER: My travel dates are Nov 20th and 22nd.

ASSISTANT: May I know your connection preference please?

USER: I am looking for a direct flight.

ASSISTANT: Ok, are you looking for any specific airlines?

USER: I prefer to fly in major airlines like American airlines.

ASSISTANT: I will check all the available flight and revert back to you, meanwhile please share your name.

USER: My name is Helen Lopez.

ASSISTANT: Sorry for the inconvenience, there is no flight available on your route.

USER: No problem, thank you.

ASSISTANT: Thank you for choosing us.