You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you today?

USER: I want to change my existing reservation to new travelling dates which I have done with my name Justin Rodriguez. Would it be possible to make changes?

ASSISTANT: Thank you for providing all necessary details, please wait for a while, I will check is there any reservation with your name.

USER: Sure, take your time to get the details about my reservation.

ASSISTANT: Thanks for your waiting, I could not find any flight with your name in our database.

USER: It's ok, thanks for checking my status.

ASSISTANT: It's my pleasure, have a great day ahead.