You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I  help you?

USER: Myself Justin Thompson. I just want to change my existing reservation, due to sudden demise of my grand mother. Will you help me with that?

ASSISTANT: Just a moment please.

USER: Thank you for your positive response.

ASSISTANT: I am sorry no reservation found on your name.

USER: Ok, not an issue.

ASSISTANT: Thank you for choosing us.

USER: Thank you for your information.