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

ASSISTANT: Hello, how may I assist you ?

USER: Owing an emergence, I want to change my existing reservation. Can you help me with it?

ASSISTANT: Sure, we are here to help you. No reservation found with your name.

USER: Ok, no issues.

ASSISTANT: Thank you for choosing us. Have a great day.

USER: Thanks for reaching us, have  a good day.