You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. Is there any help that I can assist you?

USER: I want to change my reservation as my plan to meet my friend is postponed. Can you help me with that?

ASSISTANT: Sure, I am happy to help you and can I know your name please?

USER: My name is Daniel Adams.

ASSISTANT: Please give me a moment.

USER: Sure.

ASSISTANT: Thank you for your information, there is no reservation found for the user name in our data base to change the booking.

USER: Ok, thank you for the information.

ASSISTANT: You are welcome and thank you for reaching us.