You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Jeffrey Smith.

ASSISTANT: How can I help you?

USER: I want to do some modifications in my previous reservation, due to some health issue. Will you please help me?

ASSISTANT: Sure Smith, I will help you to change your reservation.

USER: Thank you.

ASSISTANT: Can you give me a moment.

USER: Sure. take your time.

ASSISTANT: I found your reservation, can you please share me your new airport codes?

USER: Sure, my new airport codes are from DTW to EWR.

ASSISTANT: Ok, may I know your travelling dates?

USER: I would like to start my journey on 02/23 and my return will be on 02/25.

ASSISTANT: There is one flight is available for you with single connection. Shall I proceed for booking?

USER: Yes, you can proceed.

ASSISTANT: Your ticket is booked with flight number 1001 and airline is Spirit.

USER: Thank you for your service.

ASSISTANT: Welcome, have a safe journey.