You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: My name is Jack Young, I want to book a flight from LAS to DEN to attend a meeting. Can you help me with that?

ASSISTANT: Sure, May I know your travelling dates?

USER: I will fly on Feb 5 and return on Feb 07.

ASSISTANT: Do you have any connection limit?

USER: I need a connecting flight.

ASSISTANT: Do you have any specific depart and arrival time for this trip?

USER: Please find a return flight which fly in afternoon.

ASSISTANT: Is there any class preference?

USER: No.

ASSISTANT: Thanks for your details, There are no flights found on your data.

USER: Ok, thank you for the information.

ASSISTANT: Thank you.