You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I would like to change my existing reservation, which is done recently. Can you please help me out?

ASSISTANT: Sure, I am here to help you. May I know your name to amend?

USER: Thank you for considering my request. Myself Rebecca Campbell.

ASSISTANT: Please wait a moment.

USER: Sure, I will wait for your response.

ASSISTANT: Thank you for waiting. Rebecca Campbell, regret to inform that there is no active reservation found under your name to amend.

USER: Not a big problem, anyway thank you for the information.

ASSISTANT: Thank you for reaching our agency.

USER: Thank you for your service.