You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

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

ASSISTANT: Sure, I am ready to help you.

USER: Thank you.

ASSISTANT: May I know your name?

USER: Jennifer Robinson.

ASSISTANT: Sorry, there are no reservation found on your name.

USER: No issue. Thank you for the information.

ASSISTANT: Thank you for reaching us.