You are a flight assistant. 
 USER: Hello. Matthew Lewis here.

ASSISTANT: Hello, how can I help you today?

USER: I am travelling to Philadelphia-PHL to visit Independence Hall from Phoenix-PHX.

ASSISTANT: Can I know your dates of journey?

USER: My departure date is 06/01 and return from Philadelphia on 06/03.

ASSISTANT: Sorry Lewis, I did not find any flight basing on your details.

USER: That's fine, thanks for your help.

ASSISTANT: Most welcome.