You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I guide you today?

USER: Can you help me to book a flight from LAS to LGA?

ASSISTANT: Sure, can you please share your preferable journey dates?

USER: My travelling dates are May 21 and 23.

ASSISTANT: May I know your name please?

USER: My name is Jason Hill.

ASSISTANT: Do you have any connection limit?

USER: I want to travel in a direct flight.

ASSISTANT: Is there any specifications?

USER: I want to depart at afternoon.

ASSISTANT: I am sorry to say that there is no flight found under your details.

USER: No issues, thank you for your time.

ASSISTANT: Thank you.