You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I have planned to go for my 3rd sister birthday party in Washington, but I am not feeling well.So I want meet my sister on another date.Can you please alter my existing reservation?

ASSISTANT: Sure, I am here to help you, but I need to check your previous status with your name, help me by giving your name please.

USER: Myself Dorothy Mitchell, please search my ticket on my name.

ASSISTANT: Please wait a moment, let me check.

USER: Ok.

ASSISTANT: Actually, I couldn't able to get reservation on your name.

USER: Ok, fine not an issue.

ASSISTANT: Ok, thank you for choosing us.

USER: Thank you for your help.