You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Sharon Smith.

ASSISTANT: How can I serve you today?

USER:  I would like to change my existing reservation due to postpone of launching a new product at Atlanta. Can you help me out?

ASSISTANT: Sure. Please, wait.

USER: Sure.

ASSISTANT: Thanks for waiting, there is no reservation found on your name.

USER: Not an issue. Thank you.

ASSISTANT: Thank you.