You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, may I know your name?

USER: Sure, my name is Pamela Hernandez.

ASSISTANT: How may I abet you?

USER: I need to change my existing reservation as my examinations got postponed. Can you help me with it?

ASSISTANT: Sure, give me a moment.

USER: Ok.

ASSISTANT: Thanks for waiting, we did not found any reservation by this name.

USER: It's ok, thank you for your response.

ASSISTANT: Thanks for choosing us.