You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. What type of service you are excepting from us?

USER: I just want to change my existing reservation, due to sudden demise of my grand mother. Can you help me?

ASSISTANT: Sure, I am happy to help you. Sorry to say that, there is no reservation found on your name in our database.

USER: James Parker here.

ASSISTANT: Thank you for providing your information. Thank you for reaching us.

USER: Thank you.