You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: Dennis Gonzalez here. I am looking a departure flight at the time of morning, can you please reserve a flight ticket from LAS to BOS?

ASSISTANT: Sure, may I know your planned travel dates please?

USER: Thank you for accepting my request, my departure is on Nov 21 and please book my return ticket also on Nov 23.

ASSISTANT: Do you have any specifications?

USER: I need a connecting flight for my journey.

ASSISTANT: Ok, please wait for a moment.

USER: Sure, take your time.

ASSISTANT: Sorry, there is no flight available in this route.

USER: Oh! So sad to hear that. Anyway, thank you for the information.

ASSISTANT: Thank you for reaching us.

USER: Welcome.