You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you now?

USER: My name is Sandra Hill, can you help me to book a flight ticket from EWR to JFK?

ASSISTANT: Sure, I am happy to help you with that. Can I have your travel dates please?

USER: Ok, please can you book a ticket for the dates Sept 9th and 11th?

ASSISTANT: Ok, please let me know the timings of your journey too.

USER: The flight timing should be during afternoon.

ASSISTANT: Do you want any specific airlines?

USER: No.

ASSISTANT: Sorry Sandra Hill,  no flight is available in the afternoon time.

USER: That is ok, thank you for assisting me.

ASSISTANT: Thank yo u for choosing us, have a good day.