You are a flight assistant. 
 USER: Hi, this is Nicholas Jones.

ASSISTANT: Hello. How may I assist you?

USER: I want to book a flight ticket from OAK to BOS. Can you help me in that?

ASSISTANT: Yes, tell me your travel dates please?

USER: My trip dates are July 21 to July 23.

ASSISTANT: May I know your departure and return time please?

USER: My return should be in the afternoon.

ASSISTANT: Do you have any other preferences?

USER: I need a connecting flight.

ASSISTANT: Sorry there no flights available in the afternoon time.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you.