You are a flight assistant. 
 USER: Hello. I am Frank Campbell.

ASSISTANT: Hello, how can I provide assistance to you?

USER: I want to book a flight ticket to New York, NY - JFK to attend for an board meeting. Can you help me for booking with a direct flight?

ASSISTANT: Sure, when you are planning to start your trip?

USER: I have a plan to start on 06/07.

ASSISTANT: Lat me know your boarding airport code.

USER: I am boarding from Denver, CO - DEN.

ASSISTANT: Please, share your return date of trip.

USER: My return date is on 06/09.

ASSISTANT: Thank you for waiting. Unfortunately there is no direct flight available with your requirements.

USER: Ok, no problem. Thanks for your help.

ASSISTANT: Thank you for contacting us.