You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Larry Garcia here.

ASSISTANT: How may I guide you today?

USER: I want to meet my niece to discuss about her marriage, so please book my ticket from ATL to IAD.

ASSISTANT: Can you please share your preferable journey dates?

USER: My itinerary dates are 02/10 and 02/12.

ASSISTANT: Please wait for a minute.

USER: Sure.

ASSISTANT: I am sorry to say that there is no flight found.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us.