You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Virginia Brown.

ASSISTANT: What can I do for you today?

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

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Please wait for few minutes.

USER: Ok.

ASSISTANT: There is no existing reservation found on your name.

USER: No issue.

ASSISTANT: Thank you for reaching us.

USER: Thank you for the information.