You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I want to book a ticket from IAD to LAX to attend Sports meet.

ASSISTANT: Sure, I am here to assist you. Can you please provide me your travel dates?

USER: My travelling dates are Mar 22 and Mar 24.

ASSISTANT: Sure, may I know your name?

USER: Sure, I am Angela Carter.

ASSISTANT: Is there any specifications?

USER: My depart time is afternoon.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: I am sorry, there is no flight available as per your requirements.

USER: Ok, no issues. Thank you.

ASSISTANT: You are welcome and have a nice day.