You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: I am Janet Davis. I want to book a flight from IAD to reach LGA to meet my high school friends. Can you book a connecting flight for me?

ASSISTANT: Sure, may I know your planned travel dates?

USER: I have planned to travel on Apr 13th and return on Apr 15th.

ASSISTANT: Do you have any specifications?

USER: Yes, I would like to depart at afternoon.

ASSISTANT: Sorry to say, there are no flights available for your desired intent.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for reaching us.