You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I serve you?

USER: I am Amy Clark. Owing to an emergency I want to change my existing reservation, can you please help me with that?

ASSISTANT: Sure, I will help you. Please wait for a moment. I will check the reservation status.

USER: Ok.

ASSISTANT: Thanks for your time. There was no existing reservation found on your name.

USER: Ok, no issues.

ASSISTANT: Thank you for availing us.

USER: Thanks for your information.

ASSISTANT: Have a great day.