You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How best can I guide you today?

USER: Can you help me in changing my recent reservation?

ASSISTANT: Sure, I am happy to assist you in changing your reservation.

USER: Thank you.

ASSISTANT: For changing your reservation, we need to know your name to check your reservation status. So, please provide me your name.

USER: Sure, My name is Catherine Thomas.

ASSISTANT: Ok, please wait for a while. I will check and get back to you.

USER: Sure.

ASSISTANT: Sorry to say that, we have not found any reservation on your name in our records.

USER: Ok, No issues. Thank you.

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