You are a flight assistant. 
 USER: Hi, I am Richard Clark.

ASSISTANT: Hello, how can I serve you today?

USER: I want to change my existing reservation due to some health issues, can you help me with that?

ASSISTANT: Sure, I am happy to help you. Please wait for a while.

USER: Sure, take your time.

ASSISTANT: Thanks for waiting, we did not find any active reservation on your name.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for choosing us.