You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I am Jonathan Brown, I have done booking last month with wrong dates. Can you please help me to change my reservation?

ASSISTANT: Sure, I will help you. Please wait a while.

USER: Ok, sure.

ASSISTANT: There is no reservation on your name in our database.

USER: Ok, fine. Thank you for the information.

ASSISTANT: You are welcome.