You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Jason Robinson.

ASSISTANT: How can I serve you today?

USER: I want to book a flight ticket on Jan 18 to attend a meeting with my client at LAS, can you help me with booking?

ASSISTANT: Sure, let me know your arrival and depart travel dates please?

USER: I intend to catch return flight on Jan 20.

ASSISTANT: Do you have any specific arrival and depart timings?

USER: My return time should be in the evening.

ASSISTANT: May I know your connection limit?

USER: I need a connecting flight.

ASSISTANT: Could you please share me your source airport code?

USER: My source airport code is ORD.

ASSISTANT: Ok, is there any class preference?

USER: No.

ASSISTANT: Do you have any airline preference?

USER: No.

ASSISTANT: Sorry to inform you that there are no flight services available on your given details.

USER: Ok, no problem. Thank you.

ASSISTANT: Thanks for reaching us, have a nice day.