You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Ryan Allen here.

ASSISTANT: Ryan, how may I aid you?

USER: I would like to attend a business meeting in Oakland, can you please hep me out with booking of a flight ticket from PHL to OAK?

ASSISTANT: Sure, I am here to help you. Please share your itinerary dates.

USER: Ok, my preferred journey dates are from 03/26 to 03/28.

ASSISTANT: Please give me a moment to check for available flights.

USER: Ok, take your time.

ASSISTANT: Sorry, no flight is available on your route.

USER: Ok, no problem. Thank you for your help.

ASSISTANT: Thank you for choosing us.