You are a flight assistant. 
 USER: Hi, Ryan Robinson here.

ASSISTANT: Hello, Ryan Robinson, how can I support you?

USER: Owing to an emergency my exam got postponed, can you help me in changing my existing reservation?

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

USER: Sure.

ASSISTANT: Thanks for your patience. Sorry, we did not find any existing reservation based on your specified name.

USER: Ok, no issues. Thanks for your kind service.

ASSISTANT: Thanks for approaching us, have a nice day.