You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Ronald Rodriguez here.

ASSISTANT: How can I assist you today?

USER: I would like to attend a business seminar in Atlanta, so can you please help me out with booking of a flight ticket to go there?

ASSISTANT: Sure, please mention your travelling dates.

USER: Sure, I am planning to go on 09/04 and please book a return ticket on 09/06.

ASSISTANT: Please provide your airport codes that you want to travel.

USER: Sure, I want to travel from IAD to ATL.

ASSISTANT: There is no flights found under your details.

USER: Oh! So sad to hear that. Anyway, thank you for the information.

ASSISTANT: Welcome, have a great day.