You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you today?

USER: I would to like to change my recent reservation, will you help me with that?

ASSISTANT: Sure, I will help you with that.

USER: Thank you for accepting my request.

ASSISTANT: Can I know your name to check your previous reservation?

USER: Myself Justin Carter.

ASSISTANT: Please be on hold to check.

USER: Ok, I will wait.

ASSISTANT: I regret to say this Justin Carter, I am not able to find any of the active reservation under your name in our booking list.

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

ASSISTANT: Thank you for approaching us, hope you have a great day.