You are a flight assistant. 
 USER: Hello, I am Laura Garcia.

ASSISTANT: Hello, how may I help you?

USER: Due to my health issues, I want to change my existing reservation. Could you help me with it?

ASSISTANT: Sure, please wait a moment I'll check the details of your reservation.

USER: Ok.

ASSISTANT: Thanks for waiting. Sorry Garcia, in my database I didn't found any reservation regarding your name.

USER: Thanks for the quick response.

ASSISTANT: Thanks for contacting us, have a good day.