You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I be at your assistance?

USER: I am looking to do some changes in my existing reservation. Can you help me for that?

ASSISTANT: Sure, on whose name you did the reservation let me know?

USER: My name is Carolyn Martinez.

ASSISTANT: Please wait for a while.

USER: Sure, I will wait for your response.

ASSISTANT: Thank you for your time, we did not find any active reservation in your name to make changes as per your request.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for opting us.

USER: Welcome.