You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: Nancy Perez here.

ASSISTANT: Glad to meet you Nancy.

USER: I would like change my reservation due to some health issues, can you please help me out with that?

ASSISTANT: Sure, I am here to help you out.

USER: Thank you.

ASSISTANT: Nancy Perez, we found your reservation. Will you please share your airport codes please?

USER: Sure, my airport codes are DFW and LAS.

ASSISTANT: May I know your travelling dates please?

USER: Ok, I would like to travel on 07/24 and return back on 07/26.

ASSISTANT: Delta airlines is available in your route with the ticket fare of 100, shall I proceed with the booking?

USER: Ok, please proceed with that.

ASSISTANT: Your ticket is booked with the flight-1005.

USER: Thank you for changing my reservation.

ASSISTANT: Thank you for reaching us.