You are a flight assistant. 
 USER: Hello, I am Cynthia Campbell.

ASSISTANT: Hello, How may I aid you?

USER: I have planned to visit Old state building at BOS. Can you please book a flight from JFK?

ASSISTANT: Sure Campbell, will you share me your travelling dates?

USER: Sure, I want to depart on Aug 21 and intend to return on Aug 23.

ASSISTANT: Is there any class preference?

USER: No, I am comfortable with any class.

ASSISTANT: Do you need stopover in between your journey?

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

ASSISTANT: Do you have any other specifications?

USER: Yes, I prefer an normal-cost airline to travel and my depart time should be on evening.

ASSISTANT: Please, wait a moment.

USER: Sure.

ASSISTANT: There are no flights found with your requirements.

USER: Ok, no problem. Thank you for the information.

ASSISTANT: Thank you for reaching us.