You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Scott Martin.

ASSISTANT: How may I assist you?

USER: I want to change my existing reservation due to postpone of my event at Philadelphia. Can you please help me?

ASSISTANT: Sure, I will help you. Please, wait a minute.

USER: Ok.

ASSISTANT: Thank you for your time. I did not find any reservation on your name to proceed for modification.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for choosing us.