You are a flight assistant. 
 USER: Hello, I am Christine Lewis.

ASSISTANT: Hello, how may I help you?

USER: Owing to an emergency I had to request for this change reservation, Can you please help me in that?

ASSISTANT: Sure, we are here to help you. Please, stay online. I will check the previous list and revert to you.

USER: Sure.

ASSISTANT: Thank you for your valuable time. We are sorry to inform you that, no reservation was found on your name to change.

USER: Ok, no worries at all. Thanks for your information.

ASSISTANT: Thank you for reaching us, have a good day.