You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: My name is Brandon Davis. I am looking to book a flight ticket to ORD from DFW, can you help me?

ASSISTANT: Sure, help me with the travelling dates.

USER: Ok, my planned travel dates could be from 06/17 to 06/19.

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

USER: It's ok. Thank you.

ASSISTANT: Thank you for reaching us.