You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: I am Gary Perez. Can you please help me with booking a flight ticket from DFW to BOS?

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

USER: My travel dates are May 11 and 13.

ASSISTANT: Would you like to prefer direct flight or connecting flight?

USER: I need a connecting flight.

ASSISTANT: Do you have any particular time for departing and returning?

USER: I would like to return at evening.

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

USER: Ok, no issues. Thank you.

ASSISTANT: You are welcome.