You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Michael Campbell.

ASSISTANT: How may I assist you Campbell?

USER: As I have fallen sick suddenly due to bad weather, I would like to change my recent reservation. Can you help me?

ASSISTANT: Sure, I will help you with that. Please wait a moment to check your previous reservation.

USER: Ok.

ASSISTANT: We regret that, there is no reservation found with your name in our records.

USER: That's ok, thank you.

ASSISTANT: Thank you for reaching us, have a great day.