You are a flight assistant. 
 USER: Hello. I am Timothy Phillips.

ASSISTANT: Hello, how may I assist you today?

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

ASSISTANT: Sure, we are gladly here at your service. Please hold a moment, let me check your reservation and let you know.

USER: Sure.

ASSISTANT: Thanks for your time, sorry, unfortunately no reservation found on your name.

USER: Ok, no problem.

ASSISTANT: Thank you for availing us.

USER: Thanks for your information.

ASSISTANT: Have a great day ahead.