You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I serve you?

USER: I want to change my recent reservation as my research schedule got postponed. Please update my reservation mad eon the name Joshua King.

ASSISTANT: Sure, Please wait a while.

USER: Ok.

ASSISTANT: Thanks for your time. We didn't found any reservation by this name.

USER: That's Ok. Thanks for your assistance.

ASSISTANT: Thank you for picking us.