You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I aid you?

USER: I want to change my existing reservation, due to some personal problems. Can you help me?

ASSISTANT: Please share your name to proceed further?

USER: Yes, I am Jennifer Williams.

ASSISTANT: No reservation found as per your preferences.

USER: Ok, not an problem. Thank you for your information.

ASSISTANT: Thank you for reaching us.