You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I need a direct flight from IAD to DTW, please help me in booking a ticket.

ASSISTANT: Sure, may I know your name please to begin the process?

USER: My name is John Anderson.

ASSISTANT: Please provide me your journey dates for enhanced search.

USER: My journey dates are 09/25 and 09/27.

ASSISTANT: John, please wait for a minute.

USER: Sure, take your time.

ASSISTANT: John, there are no flights available with your preferred journey dates.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for choosing us, hope you visit us again.