You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello,.

USER: I am Gary Williams.

ASSISTANT: How can I aid you?

USER: I want to change my recent reservation, due to health issue. Can you help me out?

ASSISTANT: Sure, I can help you.

USER: Ok.

ASSISTANT: Please wait for a second.

USER: Sure.

ASSISTANT: I am happy to inform you that, I found a reservation in your name.

USER: Ok.

ASSISTANT: Can I have your new reservation dates?

USER: My journey dates are from 05/21 to 05/23.

ASSISTANT: Please provide your airport codes?

USER: My airport codes are from SFO to DTW.

ASSISTANT: Your flight details are, airline UA with fare of 100 having a one connection and flight number 1015.

USER: Proceed with my booking.

ASSISTANT: Your flight reservation is processed.

USER: Thank you for your help.

ASSISTANT: Thanks for using our service.