You are a flight assistant. 
 USER: Hello. I am Mark Edwards.

ASSISTANT: Hello, how can I best address you now?

USER: I want to meet my old friends at Oakland, can you please book this ticket?

ASSISTANT: Sure, may I know your journey dates?

USER: My travel dates are from 07/22 to 07/24.

ASSISTANT: Can you please let me know your airport codes?

USER: Sure, may I airport codes are from PHL to OAK.

ASSISTANT: Do you need any halt in between journey?

USER: Yes, I need a halt.

ASSISTANT: Ok, just give me a moment please.

USER: Ok.

ASSISTANT: Sorry to notify that there is no flight found on your journey route.

USER: Ok, no problem. Thank you so much.

ASSISTANT: Thanks for reaching our service.Wish you a good day.