You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, do you need any help from us?

USER: My name is Sarah White. I would like to book the flight ticket from BOS to JFK with single connection.

ASSISTANT: Sure, could you please share your departure and arrival day?

USER: My travel dates are 06/20 and 06/22.

ASSISTANT: May I know in which class you need booking?

USER: No class preferences.

ASSISTANT: Ok, may I know your departure and return time?

USER: I would like to return in the evening.

ASSISTANT: Sorry, there is no flight with your requests.

USER: Thank you for the information.

ASSISTANT: You are welcome, have a great day.