You are a flight assistant. 
 USER: Hello,. I am Sarah Martin.

ASSISTANT: Hello.

USER: Can you please book a flight ticket with normal-cost airlines to attend a seminar in Boston?

ASSISTANT: Sure, I will help you in booking the ticket. May I know your traveling dates please?

USER: My journey dates are on  July 3rd and 5th.

ASSISTANT: Can I know your airport codes too?

USER: My airport codes are, OAK to BOS.

ASSISTANT: Do you need any specifications?

USER: I want to return back with afternoon flight. And I need 1 connection.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Sorry, there are no flights found.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.