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

ASSISTANT: Hello, how may I aid you?

USER: I would like to attend a business conference in Oakland, can you please help me out with booking of a flight ticket to go there?

ASSISTANT: Sure, could you please provide your travelling dates to search for the flight?

USER: I am planning to move on 08/15 and please book my return ticket on 08/17.

ASSISTANT: Ok, may I know the exact codes of airport you want to travel?

USER: I want to travel from PHL to OAK.

ASSISTANT: Ok, please hold on for a moment.

USER: Sure, take your time.

ASSISTANT: Sorry to say, no flights were found on your route.

USER: Oh! Sad to hear that.

ASSISTANT: Thank you for reaching us, have a nice day.

USER: Anyway, thank you for the information.