You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,.

USER: I am Amanda Clark.

ASSISTANT: How can I amend you today?

USER: My bank exams got postponed so I need to change my existing reservation, Can you help me with that please?

ASSISTANT: Sure, we are glad to assist you in changing your reservation. Please, wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting. There is no reservation found with your name in our database.

USER: Ok, no problem.

ASSISTANT: Thank you for availing us.

USER: Thanks for your information.