You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you today?

USER: Owing to an emergency, I would like to change my plan to visit Boston to another day.

ASSISTANT: It's ok fine.

USER: Can you please help me in changing the existing reservation?

ASSISTANT: Sure, I will help you. Please give me a moment, I will check existing details. May I know your good name for checking?

USER: My name is Amy White.

ASSISTANT: Sorry Amy, no reservation has found under your name.

USER: Ok, no issues.

ASSISTANT: Thank you for choosing us.

USER: Thank you for your help.

ASSISTANT: You are welcome. Have a good day.