You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Jonathan Jones.

ASSISTANT: How may I render you today?

USER: I want to book a direct flight to attend a client meeting in New York, so please help me in booking a flight ticket.

ASSISTANT: Sure, please let me know your planned travelling dates.

USER: I will start on 09/26, return on 09/28.

ASSISTANT: Kindly share your boarding and landing points to proceed further.

USER: It is a round trip to New York, NY - JFK.

ASSISTANT: Ok, please wait a moment I will search best flight for you.

USER: Sure.

ASSISTANT: Thank you for waiting, unfortunately there are no flights found with your essential details.

USER: No problem, thank you.

ASSISTANT: Thank you for choosing us.