You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: As my manager did not approve my leave, I would like to change my recent reservation. Can you aid me with this?

ASSISTANT: Sure, can you provide me with your name?

USER: Myself John Campbell.

ASSISTANT: Give me a moment.

USER: Sure, take your time.

ASSISTANT: John Campbell, I regret to inform that there is no active reservation by your name.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for reaching us.