You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Raymond Smith.

ASSISTANT: How may I assist you for today?

USER: I am planning to change an existing reservation, due to health issue. So I  am not able to travel on those days. Can you please change my reservation?

ASSISTANT: Yes, I can help you with that.

USER: Thank you.

ASSISTANT: Give me a moment, I will get back to you with your reservation details.

USER: Sure, take your own time.

ASSISTANT: I have found reservation on your name. Could you share me your new travelling dates?

USER: Sure, I would like to travel on 02/28 and return back on 03/01.

ASSISTANT: Ok, can I know your nearest airport codes for the journey?

USER: My nearest source code is DEN and my destination code is IAH.

ASSISTANT: Hold on for a second.

USER: Sure, I will wait.

ASSISTANT: I have found a flight ticket for you with a price of 100 and 1 connection.

USER: That's perfect, you can proceed the booking.

ASSISTANT: Ok, your reservation has been changed successfully.

USER: Thank you for your information.

ASSISTANT: Thank you for reaching our agency.

USER: You are welcome.