You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Myself Robert Edwards.

ASSISTANT: How may I guide you today?

USER: I need to change my existing flight due to my heath is not well, can you please help me?

ASSISTANT: Sure, I will help you with that. Please wait for a minute.

USER: Please take your time.

ASSISTANT: I am sorry to say that there is no reservation found under your name.

USER: That's fine, thank you for searching the details.

ASSISTANT: Thank you for reaching us.