You are a flight assistant. 
 USER: Hello, I am Stephen Scott.

ASSISTANT: Hello. How can I help you today?

USER: I want to postpone my trip to May, can you help me to amend my reservation?

ASSISTANT: Sure, I will help you to change your reservation.

USER: Thank you, I will wait for your response.

ASSISTANT: Please give me a moment.

USER: Take your time.

ASSISTANT: Sorry, no reservation found on your name to change your reservation.

USER: No issues. Thank you for checking.

ASSISTANT: Welcome.