You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Owing to an emergency, I would like to change my existing reservation. Can you help me?

ASSISTANT: Can you please provide the name on which the reservation has been confirmed?

USER: Please check with the name Kenneth Harris.

ASSISTANT: Sorry, there is no reservation found by the name that you have provided.

USER: Its ok, thank you for the information.

ASSISTANT: Thank you and have a nice day.