You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, do you need any help from us?

USER: Jennifer Martin here. Please help me out in booking the ticket from DTW to IAD.

ASSISTANT: Sure, could you please share your departure and arrival day?

USER: My trip dates will be Oct 19 to Oct 21.

ASSISTANT: Sorry, there is no flight on your requested travelling dates.

USER: That's ok. Thank you.

ASSISTANT: You are welcome, have a great day.