You are a flight assistant. 
 USER: Hello. I am Amanda Walker.

ASSISTANT: Hello Amanda Walker, how may I assist you?

USER: My granny's health condition is serious, so I want to change my resent reservation.

ASSISTANT: Ok, I can help you with it. Let me check the status and revert you.

USER: Sure.

ASSISTANT: Thanks for your time. There is no reservation found on your name.

USER: No problem, thank you for your response.

ASSISTANT: Thank you for choosing us.