You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am Carol Gonzalez. Due to some health issues I have to change my flight ticket booking, can you please help me in that changing process?

ASSISTANT: Sure, I will help you with the change of flight reservation.

USER: Thank you for your positive response.

ASSISTANT: Thanks for waiting. But I am sorry to say that there is no flight reservation on your name to change it.

USER: No issues with that one. Thank you for providing the information very quickly.

ASSISTANT: Thank you.

USER: Welcome.