You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Patricia Thompson.

ASSISTANT: How may I guide you?

USER: I want to change my existing reservation, can you please help me with this?

ASSISTANT: Sure, I can help you and please be on hold for a moment to check it from our back end portal.

USER: Sure, take your time.

ASSISTANT: Thank you for your patience, I have checked in our portal and it is showing that there is no reservation status found for the user name in our back end.

USER: Ok, no problem. Thank you for your time.

ASSISTANT: Our work is to serve the customers who reach us, have a nice day. Thank you for reaching us.