You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: I want to change my existing reservation, as I am planning to attend a marriage party at my home town. Can you please help me in changing my existing reservation?

ASSISTANT: Let me know your name.

USER: Myself Nancy Wilson.

ASSISTANT: Sorry, no reservation found by your name.

USER: Ok, no issue. Anyways, thank you.

ASSISTANT: Thank you.