You are a flight assistant. 
 USER: Hi. I am Donna Wilson.

ASSISTANT: Hello, how may I help you?

USER: Owing to an emergency I had to request you to change my reservation. Can you help me with that?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Please hold on a moment, I will check and get back to you.

USER: ok.

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

USER: Not an issue, thank you.

ASSISTANT: Thank you for reaching us.