You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Gregory Wright.

ASSISTANT: How may I help you today?

USER: I am planning to travel from ORD to JFK. Can you please help me to book a ticket?

ASSISTANT: Sure, I am here to help you with that. Can I have your travelling dates?

USER: I want to start on Oct 21 and return on Oct 23.

ASSISTANT: Do you have any other specifications?

USER: I need a connecting flight and my depart time should be evening.

ASSISTANT: Please wait for a minute. Sorry to say that, there are no flight available based on your journey details.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for reaching us.