You are a flight assistant. 
 USER: Hello,. I am Richard Walker.

ASSISTANT: Hello, How can I help you today?

USER: I made a earlier reservation to get together  party with friends, due to some problems it got postponed. Can you please change my reservation?

ASSISTANT: Ok, please wait a minute.

USER: Sure.

ASSISTANT: Thanks for waiting, we did not find reservation on your name in our database.

USER: Ok, no issue. Thank you.

ASSISTANT: Thank you for choosing us.