You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I guide you today?

USER: Could you please book a flight ticket from OAK to BOS?

ASSISTANT: Sure, can I know your good name please?

USER: I am Christopher Rodriguez.

ASSISTANT:  When you are willing to travel?

USER: My trip dates are July 28 and July 30.

ASSISTANT: Do you need direct flight or connecting flight?

USER: I am comfortable with any flight.

ASSISTANT: Are there any other specifications?

USER: I prefer a normal cost airline.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: Not a problem, thank you for the information.

ASSISTANT: Thank you for approaching us.