You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: On a sudden business meet I need to travel to another city, so, I want to change my trip what recently I had booked a ticket, could you help me in that?

ASSISTANT: Sure, may I know your name please?

USER: My name is Ryan Robinson.

ASSISTANT: Ok Ryan, hold on for a moment please.

USER: Sure.

ASSISTANT: I found a reservation for you. Could you please provide your new journey details please?

USER: That's great. My changed city codes are from PHL to OAK.

ASSISTANT: Ok, can you please share your journey dates please?

USER: My trip dates are 05/16 and 05/18.

ASSISTANT: I found a flight for you with Delta airlines and it costs you 100. Shall I proceed?

USER: Yes, you can proceed to book my ticket.

ASSISTANT: Your ticket has been booked.

USER: Thank you for helping me.

ASSISTANT: Thank you for choosing us. Have a safe flight.