You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Nicholas Carter here.

ASSISTANT: Nice to meet you Carter.

USER: As my manager didn't sanction my leave, I want to change my recent reservation. Can you help me with that?

ASSISTANT: Sure, please wait for a while.

USER: Sure.

ASSISTANT: Sorry Carter, there is no active reservation found with your name in our records.

USER: Ok, not a problem. Thank you for the information.

ASSISTANT: Most welcome.