You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Can you please book a ticket from SEA to DTW? As I'm planning to visit my grand parents.

ASSISTANT: Let me know your travelling dates.

USER: Sure, my planned departure and return travel dates are 24th and 26th of Dec.

ASSISTANT: Do you have any preference?

USER: I want to return in the evening time in single connected flight.

ASSISTANT: Can I know your name?

USER: My name is Samuel Roberts.

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

USER: That's ok, thank you.

ASSISTANT: Thank you.