You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: I want to change my reservation, due to some problems I am unable to travel those dates, can you please change my reservation?

ASSISTANT: I am happy to help you, can you please tell us your name?

USER: Thanks,  my name is Edward Wilson.

ASSISTANT: Wilson, please wait. Let me check your reservation status in our database.

USER: Sure.

ASSISTANT: Wilson, I have not found any reservation by your name in our database.

USER: Oh! It's ok no problem. Thank you for your information.

ASSISTANT: Thank you for contacting us and have a nice day.