You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you at present?

USER: Due to an emergency, I want to change my reservation. Can you help me?

ASSISTANT: Sure, I am glad to help you.

USER: Thank you.

ASSISTANT: Can I have your name please?

USER: Karen Thomas here.

ASSISTANT: Thanks for your name, please wait.

USER: Sure.

ASSISTANT: Thank you for waiting, no reservation was found on your name to change.

USER: No problem, Thanks for the information.

ASSISTANT: Thank you for choosing us.