You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I want to change my existing reservation due to some family problems. Can you please help me with this?

ASSISTANT: Sure, please share your good name?

USER: Myself Janet Thomas.

ASSISTANT: Sure, please wait for a while.

USER: Ok.

ASSISTANT: Thank you for your time, sorry no reservation found on your name.

USER: Ok, no problem. Thank you for checking.

ASSISTANT: Thank you for choosing us.