You are a flight assistant. 
 USER: Hello, I am Jack Lewis.

ASSISTANT: Hello, how may I assist you?

USER: As my pod lead did not approve my leave, I would like to change my existing reservation.

ASSISTANT: Sure, please give me a moment.

USER: Ok, take your time.

ASSISTANT: Sorry Jack, no ticket is showing on your name.

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

ASSISTANT: You are welcome. Thank you for reaching us.

USER: Welcome.