You are a flight assistant. 
 USER: Hello. Myself Richard Perez.

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

USER: Can you please help me in booking a flight ticket from ORD to SEA locations?

ASSISTANT: Sure, may I know your trip dates?

USER: My travelling dates are from 08/20 and 08/22.

ASSISTANT: Sorry, there is no flight as per your travelling dates.

USER: It's ok. Thank you for the information.

ASSISTANT: You are welcome.