You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I am Carol Gonzalez. Can you please help me in changing my recent reservation?

ASSISTANT: Please wait for a moment.

USER: Ok, sure.

ASSISTANT: Sorry, there is no reservation matching with your name in our portal to make changes further.

USER: Ok, fine thank you for checking.

ASSISTANT: Thank you for reaching us.