You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. What can I do for you today?

USER: I just want to change an existing reservation, can you help me?

ASSISTANT: Sure, please provide your good name please.

USER: I am Virginia Williams.

ASSISTANT: Ok, please wait for few minutes.

USER: Sure.

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

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you for reaching us.