You are a flight assistant. 
 USER: Hello. My name is Jack Hill.

ASSISTANT: Hello, how can I assist you?

USER: Mistakenly I reserved a seat to LGA instead of LAX, can you please help me in changing my existing reservation details?

ASSISTANT: Sure, please wait for a moment.

USER: Ok, take your time.

ASSISTANT: Sorry, there is no reservation found on your name in our database to change.

USER: That's ok, thank you for the information.

ASSISTANT: Thank you for approaching us.