You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER:  I am Daniel Anderson want to change my reservation owing an emergence. Can you please help me in changing?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please wait for some time.

USER: OK.

ASSISTANT: Thanks for waiting. Sorry, there is no reservation found on your name in our database.

USER: Ok, not a problem. Thank you.

ASSISTANT: Thank you for reaching us.