You are a flight assistant. 
 USER: Hi, Joshua Green here.

ASSISTANT: Hello, Joshua. How may I help you today?

USER: Due to leave not approved from my company, I need to cancel my existing reservation so can you please help me?

ASSISTANT: Ok, please wait.

USER: Sure.

ASSISTANT: Sorry there is no reservation found under your name.

USER: Oh! that's fine, thanks for fast response.

ASSISTANT: Thank you for reaching us.