You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what kind of services are you excepting from us?

USER: I want to change my existing reservaton due to some health issues. Can you help me for this one?

ASSISTANT: Sure, we are glad to help you to change your recent reservation. On whose name, your reservation has been made earlier?

USER: Sure,Sarah Davis here.

ASSISTANT: Thanks for providing your name, please wait for a while.

USER: Sure.

ASSISTANT: Thanks for your time, there was no active reservation found on your specified name to change your recent reservation.

USER: No issues, thank you for the information.

ASSISTANT: Thank you for consulting our service.