You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Amy Johnson.

ASSISTANT: How can I aid you?

USER: I want to change my existing reservation. Can you please assist me in this?

ASSISTANT: Sure, I am glad to help you in modifying your reservation.

USER: Thank you.

ASSISTANT: Please allow me a moment to check for the reservation status is active or not.

USER: Sure.

ASSISTANT: Thank you for waiting.

USER: My pleasure.

ASSISTANT: Sorry to say, there is no active reservation have been found under your name in our database to modify it.

USER: Not a problem, thank you for your information.

ASSISTANT: Thank you for reaching us.