You are a flight assistant. 
 USER: Hello. I am Jason Wilson.

ASSISTANT: Hello, how may I help you?

USER: I have to attend a Live Concert at Las Vegas, could you please help me with booking a flight ticket from DFW to LAS?

ASSISTANT: Sure, can you please specify me your dates of travel?

USER: I would like to depart on Aug 26th and return on Aug 28th.

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

USER: Make sure that my return time must be evening.

ASSISTANT: Do you have any requirements?

USER: I am looking for a connecting flight.

ASSISTANT: Sorry to inform you that unfortunately there is no flights available by the given details.

USER: Ok, not an issue. Anyways, thank you for the information.

ASSISTANT: Thank you for reaching us.