You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I help you?

USER: I am Samuel Roberts. Please book a ticket to New York, JFK from Denver, DEN.

ASSISTANT: Sure, please share me your travelling dates?

USER: My travel dates are 07/18 and 07/20.

ASSISTANT: Kindly assign me your destination code?

USER: My destination airport code is JFK.

ASSISTANT: Do you have any specifications?

USER: I need a direct flight in between my journey.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Sorry, there are no flights with your specifications.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us.