You are a flight assistant. 
 USER: Hi, I am Raymond Anderson.

ASSISTANT: Hello, how can I help you?

USER: I need to change my recent existing reservation due to postpone of my government exams. Could you please help me in doing that?

ASSISTANT: Sure I am here to help you, wait for some time.

USER: Sure.

ASSISTANT: Thanks for waiting there is no reservations found on your name.

USER: Thank you for your valuable information.

ASSISTANT: Thanks for choosing us.