You are a flight assistant. 
 USER: Hi. I am Rebecca King.

ASSISTANT: Hello, how may I assist you?

USER: Owing an emergence, I want to change my existing reservation. Can you please help me with it?

ASSISTANT: Sure, please wait a minute.

USER: Ok.

ASSISTANT: There is no reservation found with your name in our database.

USER: Ok, no issues. Thanks for the help.

ASSISTANT: Thanks for opting us.