You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: Please help me to book a direct flight to Detroit to attend my sister's marriage.

ASSISTANT: Can I know your travelling dates?

USER: 11/26 and 11/28 are my planned travelling dates.

ASSISTANT: Let me know your airport codes.

USER: JFK and DTW are my exact airport attributes.

ASSISTANT: Can I know your name?

USER: I am Katherine Baker.

ASSISTANT: Sorry, no flights found for your travelling dates.

USER: That's ok, No problem. Thank you.

ASSISTANT: Thank you.