You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I be of your service?

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

ASSISTANT: Sure. Let me know your good name please.

USER: My name is Janet Campbell.

ASSISTANT: Ok, please wait a minute.

USER: Sure.

ASSISTANT: Thank you for being patient. Unfortunately there is no reservation found with your name.

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

ASSISTANT: Thank you for picking us.