You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: Emma Robinson here. I will be visiting OAK for my friend's birthday party, can you find a flight from ORD?

ASSISTANT: Ok, let me know your dates of travel.

USER: My travelling dates will be from 08/27 to 08/29.

ASSISTANT: Sorry, there is no flight for you on your route.

USER: Oh! That's very sad to know. Thank you for checking.

ASSISTANT: Thanks for choosing us.

USER: You are most welcome.