You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: I am Mark Evans, please search flights on these routes PHX to ORD?

ASSISTANT: Sure, can I know the travel dates please?

USER: My travelling dates are 08/27 and 08/29.

ASSISTANT: Ok, wait a moment please.

USER: OK.

ASSISTANT: Sorry, there are no flights available on your route.

USER: Oh! It's ok no problem, thank you for your services.

ASSISTANT: Thank you for approaching us.