You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, what type of help you are looking from my side?

USER: I want to change my reservation due to health problem, can you help me?

ASSISTANT: Yes, I will help you in changing your reservation.

USER: Thank you.

ASSISTANT: Can you please provide your name to check the existing reservation under your name?

USER: Myself Jason Parker.

ASSISTANT: I regret to say this, there are no existing reservations under your name Parker.

USER: No problem, thanks for checking.

ASSISTANT: You are most welcome, thank you for reaching out here.