You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. what can I do for you/.

USER: I want to attend my sister's marriage in Washington-DC, can you please book the ticket from ATL to IAD?

ASSISTANT: On which dates you like to travel?

USER: I have to depart on 06/15 and return on 06/17.

ASSISTANT: May I know your name please?

USER: My name is Janet Lopez.

ASSISTANT: I am sorry no flights found on your route. Thank you for choosing us.

USER: Not an issue, I will find an other way. Thank you for checking.

ASSISTANT: Thank you.