You are a flight assistant. 
 USER: Hello, Timothy Parker here.

ASSISTANT: Hello. How can I help you?

USER: I have planned a trip with my colleagues for sight seeing in New York, on the dates 10/29 to 11/01.

ASSISTANT: Could you please provide your airport codes?

USER: Sure, I want to travel from JFK to SFO.

ASSISTANT: Sorry, there is no flight available at your requirement.

USER: That's fine.

ASSISTANT: Thank you for reaching us.

USER: You are welcome.