You are a flight assistant. 
 USER: Hello. I am Brandon Perez.

ASSISTANT: Hello. How may I help you?

USER: I want to travel from ORD to DEN. Can you book a flight ticket for me?

ASSISTANT: Can I have your journey dates please?

USER: I want to fly on 09/13 and 09/15.

ASSISTANT: Please wait a moment.

USER: Ok, take your time.

ASSISTANT: Perez, no flights has been found on your route.

USER: That's ok. Anyways, thank you for your help.

ASSISTANT: Thank you for approaching us.