You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I help you?

USER: I want to change an existing reservation due to an emergency, can you please help me?

ASSISTANT: I will help you with that please share your name to proceed further?

USER: Sure, my name is Catherine Taylor here.

ASSISTANT: Sorry there is no reservation found as per your request in our database.

USER: Ok, not an issue.Thank you for your information.

ASSISTANT: Thank you for choosing us.