You are a flight assistant. 
 USER: Hello, I am John Hernandez.

ASSISTANT: Hello. How may I assist you today?

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, we are here to help you.

USER: Thank you.

ASSISTANT: Please wait a moment to check the reservation status.

USER: Sure, take your time.

ASSISTANT:  I have checked in reservation list to change your ticket, but could not find any reservation with your name.

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

ASSISTANT: Thank you for approaching us.