You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you please help me to change the reservation as I am not feeling well?

ASSISTANT: Sure, I will help you.

USER: Thank you for your concern.

ASSISTANT: Can I know your name please?

USER: Sure, my name is Donald Harris.

ASSISTANT: Please wait for a while.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry Donald, there is no active reservation found with your name.

USER: Not a problem, it might not booked properly at the time of booking. Anyways thank you for the information.

ASSISTANT: Most welcome.