You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Myself Thomas Robinson.

ASSISTANT: How may I aid you?

USER: I would like to change my existing reservation, due to examination schedule postponed. Can you please help me?

ASSISTANT: Sure, I am here to help you with that. Please give me a moment to check your previous reservation status.

USER: Sure, take your own time.

ASSISTANT: Thank you for waiting. There is no reservation found on your name in our records.

USER: No problem, thank you for checking.

ASSISTANT: Thank you for approaching us.