You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello.

USER: I am John Williams.

ASSISTANT: How can I help you today?

USER: I need a connecting flight to attend a conference in Las Vegas.

ASSISTANT: May I know your trip dates?

USER: My journey dates are, Apr 2nd and 4th.

ASSISTANT: Please share me your departure and arrival time.

USER: I would like to depart in the morning from Boston.

ASSISTANT: May I know your airport codes?

USER: My airport codes are, BOS to LAS.

ASSISTANT: Do you have any connection limit?

USER: Yes, I need a connection in between journey.

ASSISTANT: Do you need any class preferance?

USER: No.

ASSISTANT: Sorry, there are no flights available on your routes.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for opting us.