You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: My name is Jerry Brown. Can you please help me in changing my existing reservation details?

ASSISTANT: Please wait a moment, let me check the status of your reservation.

USER: Sure.

ASSISTANT: Thanks for your patience, there is no reservation found under your name.

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

ASSISTANT: Ok, thanks for contacting us.