You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I render you at this moment?

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

ASSISTANT: Sure, may I know your good name please?

USER: Myself Patrick Miller.

ASSISTANT: Ok, please wait for few minutes.

USER: Sure.

ASSISTANT: There is no existing reservation found on your name in our records.

USER: It's ok, thank you.

ASSISTANT: Thank you for reaching us.