You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: My name is Jacob Taylor.

ASSISTANT: In which way I can help you at this time?

USER: I want to change my existing reservation due to some health issues. Can you help me?

ASSISTANT: Sure, I will help you with that. Please be hold on for a moment, I will check the details to cancel. To change your reservation, some time is required.

USER: Ok.

ASSISTANT: Thank you for your patience. Sorry Jacob, no reservation has found to change the reservation.

USER: It's ok.

ASSISTANT: Thank you for reaching us.

USER: Thank you for the information.

ASSISTANT: You are welcome, have a good day.