You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you today?

USER: I need to book a flight ticket from JFK to DTW, Can you please help me for booking?

ASSISTANT: Sure, may I know your travelling dates?

USER: I would like to travel on 12/26 to return on 12/28.

ASSISTANT: Do you need any specifications?

USER: No.

ASSISTANT: Please wait a moment.

USER: Sure.

ASSISTANT: Sorry, there are no flights found on given dates.

USER: Ok, no problem.

ASSISTANT: Can you please mention your name.

USER: Thanks for your information. Sandra Davis.

ASSISTANT: Thank you for reaching our service.