You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you?

USER: I am Samantha Perez. I want to change my existing reservation due to postpone of my exams, so can you please help me with this?

ASSISTANT: Sure, please wait for a moment to check your details.

USER: Sure, I will wait for your response.

ASSISTANT: Thank you for waiting, no reservation found on your name.

USER: Not a problem, thank you for the information.

ASSISTANT: Thank you for reaching us.