You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, may I know your good name please?

USER: My name is Jonathan Carter.

ASSISTANT: How may I help you?

USER: I planned to attend my friend marriage. Due to some reason, I want to change my reservation dates.

ASSISTANT: OK, please wait a moment. Sorry, no reservation found with your name.

USER: OK. Thanks.

ASSISTANT: Thanks for choosing us.