You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Emma Young.

ASSISTANT: How may I be your helping hand today?

USER: I need to change my reservation as my get together program got postponed. Can you help me?

ASSISTANT: Sure, please wait for few minutes.

USER: Ok.

ASSISTANT: There is no existing reservation found on your name in our records.

USER: That's Ok, thanks for your response.

ASSISTANT: Thank you for reaching us.