You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you?

USER: I am Angela Harris here. I need to book a flight ticket from Washington IAD to New York JFK. Can you please help me with booking a flight ticket?

ASSISTANT: Sure, can you provide your journey dates?

USER: My journey dates are from 07/15 to 07/17.

ASSISTANT: Sorry, there is no flight on your given dates.

USER: Not a big problem, anyway, thank you for the information.

ASSISTANT: Thank you for reaching us.