You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you for today?

USER: I am Patricia Parker, planning to visit Seattle. Can you please book me a ticket from DTW to SEA?

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: I am planning my journey on the dates of Feb 18 and Feb 20.

ASSISTANT: Do you have any airline preferences?

USER: No.

ASSISTANT: Do you have any class preferences?

USER: No, I don't have any class preference.

ASSISTANT: Do you have any other requirements that you are looking for?

USER: I would like to depart in the evening time flight.

ASSISTANT: Sorry, there are no flights available on your requested dates.

USER: Ok, not an issue. Thank you for providing information.

ASSISTANT: Thank you for contacting us, have a nice day.