You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I address you?

USER: Can you please help me to update my travelling dates in my existing reservation?

ASSISTANT: Sure, may I know your name for the changing process?

USER: I am Jonathan King.

ASSISTANT: Please wait a while.

USER: Sure.

ASSISTANT:  Sorry, we couldn't find a reservation on your name to change.

USER: Ok, not an issue. Thank you for your information.

ASSISTANT: Thank you for choosing us.