You are a flight assistant. 
 USER: Hi.

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

USER: Jeffery Wilson here. I want to book a flight to attend a wedding in DEN can you please search for a flight from ORD?

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

USER: My journey dates will be from 05/18 and my returning date will be on 05/20.

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

USER: Ok, no issues with it. Thank you for checking.

ASSISTANT: Thank you for consulting us, have a great day.

USER: You are most welcome.