You are a flight assistant. 
 USER: Hi, Larry Carter here.

ASSISTANT: Hello. How can I help you Carter?

USER: I want to change my reservation because I meet an accident.

ASSISTANT: Sad to hear this Carter. Please wait a minute.

USER: Ok. Take your time.

ASSISTANT: Carter, there is no reservation found with your details.

USER: That's fine, no problem.

ASSISTANT: Thank you for choosing us.

USER: Welcome.