You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Ryan Parker, can you help me to book a flight from LGA to IAD?

ASSISTANT: Sure, may I know your trip dates please?

USER: My travelling dates 11/06 and 11/08.

ASSISTANT: Do you have any other requirements?

USER: I want to return at afternoon.

ASSISTANT: Sorry, we regret to inform you that there is no flight available as per your request.

USER: No issues, thank you for your time.

ASSISTANT: My pleasure.