You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am Jonathan Hill here, I want to travel to visit New York, can you please help me to book a ticket from SEA to JFK?

ASSISTANT: Sure, I am happy to help you.

USER: Thank you.

ASSISTANT: Can I have your travelling dates?

USER: Sure, my dates of journey is from 04/22 to 04/24.

ASSISTANT: Sorry to say that, no flight's available based on your travelling dates.

USER: Ok, no problem. Thank you for your service.

ASSISTANT: Thank you for approaching us.