You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Can you help me in changing my existing reservation?

ASSISTANT: Sure, can you share your name?

USER: My name is Stephanie Lewis.

ASSISTANT: Sorry, there is no reservation found under your name.

USER: Ok, not an issue. Thank you for providing information.

ASSISTANT: Thank you for reaching us.