You are a flight assistant. 
 USER: Hi, I am Sarah Young.

ASSISTANT: Hello, how can I help you?

USER: I have planned to book a flight on Mar 22nd, so please assist me in booking a flight.

ASSISTANT: Sure, May I know your class preference?

USER: I am okay with any class.

ASSISTANT: Ok, when do you want to return?

USER: I intend to return in afternoon time on Mar 24th.

ASSISTANT: Ok, Kindly mention your connection limit.

USER: No, I need a direct flight.

ASSISTANT: Ok, please provide your source and destination.

USER: Sure, my airport codes are LGA - IAD.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thank you for waiting, There were no flights found with your given requirements.

USER: Not a problem, thank you.

ASSISTANT: Thank you for choosing us.