You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I useful to you?

USER: Can you help me change my existing reservation which was made on the name of Jacob Turner due to some health issues?

ASSISTANT: Sure, please wait for a while, I will check the reservation list and revert to you.

USER: Ok.

ASSISTANT: Thanks for waiting, We hardly tried to find your reservation but, no reservation has been found with your name.

USER: It's ok, thank you for the information.

ASSISTANT: Thanks for opting us.