You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, good morning.

USER: My name is Nancy Johnson.

ASSISTANT: Johnson, how can I assist you today?

USER: I have a business meeting in Boston, Can you please help me for booking?

ASSISTANT: Sure, may I know your airport codes?

USER: My airport codes are OAK and BOS.

ASSISTANT: Can you tell us your journey dates?

USER: I would like to travel on 09/17 and return on 09/19.

ASSISTANT: Please hold on, let me check for the available flights to BOS.

USER: Ok, take your time.

ASSISTANT: Sorry to say you, there are no flights available to BOS on 09/17.

USER: That's ok. Thank you for your information.

ASSISTANT: Thank you for reaching us, have a nice day.

USER: Welcome.