You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: Can you please help me to change the details in the past ticket? Because the meeting which is held at Austin is changed to New York city. So, I need to change the airport codes.

ASSISTANT: Sure, may I know your name for checking?

USER: Ok, my name is Sharon Scott.

ASSISTANT: Give me a minute.

USER: Ok, take your time.

ASSISTANT: Sorry, there is no active reservation found under your name.

USER: It's ok, thank you for your time.

ASSISTANT: Thank you for reaching us.