You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you today?

USER: Can you please help me in changing my recent reservation?

ASSISTANT: Sure, may I know your name to check for the previous reservation?

USER: I have confirmed my flight ticket with name Sarah Jones.

ASSISTANT: Give me a moment. Sarah, there is no reservation found under your name.

USER: Ok, fine. Thank you for checking.

ASSISTANT: Thank you for reaching us.