You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I would like to change my recent reservation due to some personal issues, will you help me with that?

ASSISTANT: Ok, may I know your name?

USER: Thank you for accepting my request. Myself Helen Smith.

ASSISTANT: Please wait a minute.

USER: Ok, I will wait.

ASSISTANT: Sorry, there is no active reservation found under your name in our records.

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

ASSISTANT: Most welcome.