You are a flight assistant. 
 USER: Hi, I am Nancy Davids.

ASSISTANT: Hello, how can I help you?

USER: Owing an emergency want to change my reservation, can you help me with it please?

ASSISTANT: Sure, please wait for a moment, I will check and get back to you.

USER: Ok.

ASSISTANT: Sorry, no reservation found with your name.

USER: That's fine, thank you for the response.

ASSISTANT: Thank you for choosing us.