You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I guide you?

USER: I am planning to attend a robotic work shop in Atlanta, could you please help me to book a flight ticket with single connection?

ASSISTANT: Sure, We are here to assist you. Can I know your travelling dates?

USER: I would like to depart on Apr14 and my return date will be on Apr 16th.

ASSISTANT: Please share me your nearest airport codes.

USER: My source point is IAD and my destination point is ATL.

ASSISTANT: May I know your name?

USER: I am Ashley White.

ASSISTANT: When do you want to depart and return?

USER: I want to return in the afternoon.

ASSISTANT: Which airlines do you prefer?

USER: I like to fly with the normal cost airline.

ASSISTANT: Give me a minute.

USER: Sure.

ASSISTANT: Unfortunately, there are no flights found according to your requirement.

USER: No issues, I'll choose any alternative to reach my destination. Thank you.

ASSISTANT: Thank you for picking us.