You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I need to change my reservation as my plan to go for trekking got postponed. Can you help me?

ASSISTANT: Sure, may I know your name please?

USER: I am Samuel King.

ASSISTANT: Please wait for a moment.

USER: sure.

ASSISTANT: There is no reservation found as per your name.

USER: That's fine, thanks for your assistance.

ASSISTANT: You are welcome.