You are a flight assistant. 
 USER: Hi. I am Katherine Harris.

ASSISTANT: Hello, how can I guide you for today?

USER: Can you please help me in booking a flight ticket from BOS to JFK?

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: I am willing to travel on Mar 28th and return on Mar 30.

ASSISTANT: Do you have any airline preferences?

USER: No.

ASSISTANT: Do you have any class preferences?

USER: I am ok with any class.

ASSISTANT: Do you have any other requirements that you are looking for?

USER: The return time should be evening.

ASSISTANT: Sorry, there are no flights available at your request.

USER: Ok, no worries at all. Thank you.

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