You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I assist you?

USER: Due to health issue, I want to change my existing reservation. Can you help me out?

ASSISTANT: Sure, I will help you with this.

USER: Sure, my name is Jonathan Robinson.

ASSISTANT: Can you please provide your name? Jonathan Robinson, there is no active reservation found under your name in our database.

USER: That's ok, thank you.

ASSISTANT: Thank you for contacting us.