You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Barbara Adams.

ASSISTANT: How can I aid you?

USER: Due to sudden work, I need to change my reservation. Can you please help me with it?

ASSISTANT: Sure, I am here to do that. Please wait for a while.

USER: Ok.

ASSISTANT: Sorry, there is no reservation on your name.

USER: Ok, not an issue.

ASSISTANT: Thank you for reaching us.

USER: Thank you for your information.