You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: Can you please help me in changing my existing reservation?

ASSISTANT: Sure, I will help you with this.

USER: Ok.

ASSISTANT: Can you please provide your name to check the reservation status?

USER: I have reserved my flight ticket with name Rebecca Young.

ASSISTANT: Rebecca Young, there is no active reservation found under your name in our database.

USER: Ok, fine. Thank you for checking.

ASSISTANT: Thank you for contacting us.