You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Timothy Allen.

ASSISTANT: Yes, Allen.

USER: I am planned trip has been postponed, can you help me change my reservation.

ASSISTANT: Sure, I will help you out.

USER: Thanks.

ASSISTANT: Please wait a moment, let me check the previous reservation details. Sorry Allen, no reservation found on your name.

USER: Thank you for your help.

ASSISTANT: Thank you for reaching us.