You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Nicholas Martin. Due to my health problem I want to change my reservation, can you please help me to change my reservation?

ASSISTANT: Sure Martin, I am here to help you. Let me check your reservation status in our records.

USER: Thank you.

ASSISTANT: Martin sorry to intimate, no reservation is found in your name in our database.

USER: That's fine, thank you for your service.

ASSISTANT: You are welcome.