You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I serve you today?

USER: I want to change my existing reservation because my branch meeting has been postponed.

ASSISTANT: Sure, may I know your name?

USER: I am Kevin Phillips.

ASSISTANT: Please wait for a couple of moments.

USER: Ok.

ASSISTANT: Thank you for your valuable time. There is no reservation found on your name.

USER: Ok, not an issue. Thanks for your response.

ASSISTANT: Thank you for opting us.