You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Stephen Parker here.

ASSISTANT: Parker, how can I assist you?

USER: Can you please help me out in changing my recent reservation? As my health is not well.

ASSISTANT: Sure, I will help you in changing your reservation. Let me check your reservation status.

USER: Sure, I'll wait.

ASSISTANT: Parker, I have not found any reservation under your name in our database.

USER: That's ok, thank you for giving the information.

ASSISTANT: You are most welcome and thank you for choosing us.