You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Jack Lewis.

ASSISTANT: How may I help you today?

USER: I am looking a direct flight , could you please help me with booking a flight ticket with my requirement?

ASSISTANT: Sure Jack Lewis, can you please share your travelling dates for this journey please?

USER: I would like to take off on 04/13 and return on 04/15.

ASSISTANT: Ok, may I know your desired airport codes for your planned journey?

USER: My source airport code is DEN and destination airport code is OAK.

ASSISTANT: Sorry to tell you, there is no flight available on your request.

USER: That's ok, I will find an another alternate way to complete my trip. Anyways, thank you for the information.

ASSISTANT: Sorry for the inconvenience, thank you for choosing us. Have a great day.