You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you today?

USER: I want to change my reservation due to health problem, can you help me?

ASSISTANT: Sure, I am here to help you with this. May I know your name please?

USER: Myself Samantha Nelson.

ASSISTANT: Please wait for a mean while.

USER: Sure.

ASSISTANT: There is a reservation found under your name to change, can you please share me with your dates of journey?

USER: My travel dates are 03/27 and 03/29.

ASSISTANT: Ok, may I know your respective airports codes please?

USER: My airport codes are from OAK to SFO.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: There is a flight with the connecting flight of fare 100 and the airline is naming as Delta, shall I book this ticket?

USER: Yes, please.

ASSISTANT: Ok, your ticket has been confirmed.

USER: Thank you for booking.

ASSISTANT: You are welcome, have a safe flight.