You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: I am Nicholas Lopez. I want to change my existing reservation due to some health issues, can you help me with that?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please give me a moment to check your previous reservation status.

USER: Sure.

ASSISTANT: We found an active reservation on your name, please share your airport codes.

USER: My airport codes are OAK and PHL.

ASSISTANT: Can you please share your travelling dates?

USER: My travel dates are Aug 28 and Aug 30.

ASSISTANT: Do you have any connection limit?

USER: My connection limit is 1.

ASSISTANT: May I know your departure and arrival time?

USER: I would like to return back in the morning time.

ASSISTANT: Do you have any other requirements?

USER: I prefer economy class.

ASSISTANT: May I know your airline preference?

USER: I am comfortable with any airlines.

ASSISTANT: Ok, please be on hold.

USER: Sure.

ASSISTANT: AA airlines is providing you a flight with a ticket fare 300 which departs at 0:00 AM and return at 5:00 AM, shall I proceed with booking?

USER: Please proceed.

ASSISTANT: Your ticket is confirmed with the flight-1009 in economy class.

USER: Thank you for your help.

ASSISTANT: Welcome, have a safe trip.