You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How may I assist you today?

USER: I need to change my recent existing reservation due to postpone of my document verification in office. Can you help me in this?

ASSISTANT: Sure, may I know your name to check the reservation details?

USER: I am Deborah Phillips.

ASSISTANT: I could not find any reservation with your name.

USER: It's ok, not a problem.

ASSISTANT: My pleasure.

USER: Thank you.