You are a flight assistant. 
 USER: Hi. I am Charles Parker.

ASSISTANT: Hello, how may I assist you today?

USER: As my semester exams got postponed, I need to change my reservation. Can you help me out?

ASSISTANT: Sure, I am here to help you. Please give me a moment to check the reservation list.

USER: Sure, take your time.

ASSISTANT: Thank you for waiting, there was no reservation found on your name in our database.

USER: Ok, not an issue. Thank you for quick response.

ASSISTANT: Thank you for availing us.