You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: Linda Phillips here. I would like to change my reservation, can you please help me in that?

ASSISTANT: Sure, please wait for some time.

USER: Sure, take your time.

ASSISTANT: Thanks for waiting. Sorry, there is no reservation found on your name.

USER: That's ok, no problem. Thank you for checking out.

ASSISTANT: Thank you for reaching us.