You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Jessica Young.

ASSISTANT: How can I aid you?

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

ASSISTANT: Sure. Please wait a while.

USER: Sure, I will wait for your response.

ASSISTANT: Thanks for your time.

USER: ok.

ASSISTANT: We didnt found any reservation by this name.

USER: Not an issue. Thank you for your kind information.

ASSISTANT: Thank you for choosing us.