You are a flight assistant. 
 USER: Hello, I am Carolyn Miller.

ASSISTANT: Hello, how may I oblige you today?

USER: As my manager did not approved my leave, can you help me to cancel my recent reservation?

ASSISTANT: Please give me a moment, I will check and back to you.

USER: Sure.

ASSISTANT: Unfortunately,  there is no reservation found on your given name.

USER: Ok, no problem.

ASSISTANT: Thank you for communicating with us.

USER: Thanks for the information.