You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can  I aid you?

USER: Please book a direct flight to Detroit.

ASSISTANT: Sure, provide me your travel dates?

USER: Sure, the journey dates are from 01/16 to 01/18.

ASSISTANT: Do you have any preference?

USER: Yes, I can pay an amount of 500 only.

ASSISTANT:  May I know your travel airport code?

USER: The airport codes are Seattle, SEA is the source. Destination is Detroit, DTW to attend the religious festival.

ASSISTANT: Ok, may I know your good name for further process?

USER: I am Nicole Baker.

ASSISTANT:  Please wait I will revert you.

USER: Ok.

ASSISTANT: Sorry to inform you that no direct flights are available on your travel dates.

USER: Ok, Thank you.

ASSISTANT: Thank you for opting us.