You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you today?

USER: Can you please help me in changing my recent reservation? As my health is not good to do journeys right now.

ASSISTANT: Sure, can I know your name?

USER: Sure, my name is Raymond Lee.

ASSISTANT: Sorry, we could not found any reservation on your name.

USER: That's ok, may be I have done a wrong booking. Thank you anyways.

ASSISTANT: Thank you.