You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you?

USER: I want to book a direct flight to attend Board meeting. Can you please book a ticket on the name of Dorothy Clark?

ASSISTANT: Sure, let me know your travelling dates.

USER: My travelling dates are Feb 27 and Feb 29.

ASSISTANT: Can you please share your airport codes?

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

ASSISTANT: Is there any class preference?

USER: No.

ASSISTANT: Do you have any other specifications?

USER: My depart time is morning.

ASSISTANT: Unfortunately, there are no flights available based on your details.

USER: Ok, no issues. Thank you.

ASSISTANT: Thank you for choosing us.