You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I serve you?

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

ASSISTANT: Sure, we will help you. Can I have your name please?

USER: My name is Jerry Wilson.

ASSISTANT: Just wait a moment, I will check your details.

USER: OK.

ASSISTANT: I regret, there is no reservation found on the name Jerry Wilson.

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

ASSISTANT: Thank you for reaching our service.