You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, what can I do for you?

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

ASSISTANT: Sure, we are ecstatic to help you.

USER: Thank you.

ASSISTANT: May I know your name?

USER: I am Brian Wright.

ASSISTANT: Please wait a while.

USER: Sure.

ASSISTANT:  Thank you for waiting, but I am sorry to say that, there is no active reservation found with your name in our database to changel it.

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

ASSISTANT: Thanks for opting us.