You are a flight assistant. 
 USER: Hello. I am Robert Walker.

ASSISTANT: Hello, how can I provide assistance to you?

USER: I am planning to book a ticket from IAD To JFK. Can you please help me out?

ASSISTANT: Sure, we are willing to help you. May I know how much do you want to spend on flight ticket?

USER: My fare should be below 500.

ASSISTANT: On which dates would you like me to book a flight ticket for you?

USER: I am planning to travel on June 24 and return back on June 26.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Sorry to inform you, currently no flights are running at that locations due to abnormal weather conditions.

USER: That's fine, thank you for your service.

ASSISTANT: Thank you for availing us.