You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, How may I help you?

USER: Owing to an emergency  I need to change my existing reservation. Can you please help me out with this?

ASSISTANT: Ok, Can you please provide me your name?

USER: Sure,I am Andrew Carter.

ASSISTANT: Please wait for a moment, I will get back to you with the information.

USER: Ok.

ASSISTANT: Thanks for waiting, We did not find a reservation on your name.

USER: Ok. No issue. Thank you for your information.

ASSISTANT: Thank you, Have a great day.