You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I address you?

USER: I am Alexander Johnson. 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, let me check the current status and revert you.

USER: Ok.

ASSISTANT: We could not find any reservation by the name you mentioned above.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for reaching us.