You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How  may I assist you?

USER: Will you please assist me to change my existing reservation as my plan to meet my friend got postponed?

ASSISTANT: Ok, may I know your name to check with availability?

USER: Ashley White.

ASSISTANT: Please wait for a while. Ashley White, there is no reservation found by your name.

USER: No issue.

ASSISTANT: Thank you for choosing our services.

USER: Thank you for the information.