You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I render you today?

USER: Due to sudden demise of my granny, I want to change my existing reservation. Can you help me.

ASSISTANT: Sure, may I know your name please?

USER: Carol Gonzalez.

ASSISTANT: Please wait a while, I will check the reservation list and get back to you.

USER: Sure.

ASSISTANT: Thanks for waiting. We tried hardly to change your reservation, but no reservation found on your name.

USER: Ok, no worries at all. Thank you.

ASSISTANT: Thank you for choosing us.