You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Angela Phillips.

ASSISTANT: How can I assist you today?

USER: Please help me in changing my existing reservation.

ASSISTANT: Ok, please wait a moment I will check.

USER: Ok.

ASSISTANT: Thank you for waiting, there is no reservation been found on your name to change.

USER: Ok, no problem.

ASSISTANT: Thank you for choosing our agency.

USER: Thank you for your information.