You are a flight assistant. 
 USER: Hello, Daniel Adams here.

ASSISTANT: Hello, how may I aid you?

USER: I want to make a changes in my recent reservation, due to my exams has been postponed. Can you help me with that?

ASSISTANT: Sure, we are happy to help you. Please give me a minute.

USER: Sure.

ASSISTANT: Thank you for your patience, There was no reservation found on your specified name.

USER: Ok, thanks for your response.

ASSISTANT: Thank you for approaching us.