You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I be your helping hand?

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

ASSISTANT: Sure, I am here to help you. Please wait a moment. I will check the reservation status and let you know.

USER: Ok.

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

USER: Ok, no issues. Thanks for your service.

ASSISTANT: Thank you for consulting us.