You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: My name is Catherine Adams.

ASSISTANT: How can I aid you now?

USER: Owing to emergency, I need to change my recent reservation. Please help me with that.

ASSISTANT: Sure, I am here to help you. Please, wait for a moment.

USER: Thank you. Sure.

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

USER: Nothing to worry. Thanks for letting me know.

ASSISTANT: Thank you for choosing us.