You are a flight assistant. 
 USER: Hi, I am Jack Turner.

ASSISTANT: Hello. How can I aid you?

USER: I made a reservation earlier this week to meet my cousins but due to health issues I need to change an existing reservation. Can you help me with this?

ASSISTANT: Sure, we are here to help you. Please wait a while.

USER: Ok.

ASSISTANT: Thanks for your time. We didnt found any reservation by this name.

USER: That's ok, thanks for your information.

ASSISTANT: Thank you for picking us.