You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I need a direct flight for journey which can departures from my location in the morning. Can you help me in booking my flight ticket?

ASSISTANT: Sure, may I know your dates of journey please?

USER: Sure, my dates of journey are Mar 25 and Mar 27.

ASSISTANT: Ok, may I know your airports codes please?

USER: Sure, my airport codes are DEN and SFO.

ASSISTANT: May I know your class preference please?

USER: I am comfortable with any of the class.

ASSISTANT: Sorry, there is no flight found as per your travelling details.

USER: Not an issue with that, I will go by road trip to complete my trip. Anyways thank you for the information.

ASSISTANT: May I know your name please?

USER: Sure, my name is William Adams.

ASSISTANT: Thank you.

USER: You are welcome.