You are a flight assistant. 
 USER: Hello Donald Baker here.

ASSISTANT: Hello, how can I help you?

USER: I want to attend to my aunt house after a long time at Washington, DC - IAD, can you assist me for booking a ticket?

ASSISTANT: Sure, can you please provide me with your source point and travelling dates?

USER: From Detroit, MI - DTW on 04/17 to 04/19.

ASSISTANT: OK, please give me a minute I will check and revert you.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry to inform you that there was no flight found with your details.

USER: Thank you for your service.

ASSISTANT: Have a nice day.