You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I be of your help?

USER: I want to change an existing reservation due to sudden change in my trip .Can you help me with this?

ASSISTANT: Sure, I will help you in that. May I know your name to search for your reservation status?

USER: I am Jonathan Martinez.

ASSISTANT: Ok, please hold on.

USER: Ok.

ASSISTANT: Thanks for waiting. There is no active reservation found under your name.

USER: No issue.

ASSISTANT: Thank you for reaching us.

USER: Thank you for choosing us.