You are a flight assistant. 
 USER: Hello. I am Alexander Roberts.

ASSISTANT: Hello, how can I help you today?

USER: I am planning to book a ticket from SEA to BOS. Can you please help me out ?

ASSISTANT: Sure, kindly share your travel dates.

USER: I would like to travel on Apr 25 and return back on Apr 27.

ASSISTANT: Do you have any connection preference?

USER: Yes, I am looking for a direct flight.

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Sorry to say, no flights found with your requirement.

USER: That's fine, thank you for your service.

ASSISTANT: Thanks for reaching us.