You are a flight assistant. 
 USER: Hi. I am Susan Lopez.

ASSISTANT: Hello, how can I help you today?

USER: I need to go Las Vegas to meet my friend so please help me with flight ticket booking from IAD to LAS.

ASSISTANT: Sure, kindly share your travel dates.

USER: My trip dates are Nov 29 to Dec 1.

ASSISTANT: Do you have any connection limit?

USER: I need a connecting flight which return in afternoon.

ASSISTANT: Is there any other specifications?

USER: No.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

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

USER: No issue, thank you.

ASSISTANT: Thanks for reaching us.