You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Can you please help me to change the source airport code in my past ticket?

ASSISTANT: Sure, may I know your name please?

USER: Thank you for considering my request. My name is Elizabeth Lopez.

ASSISTANT: Ok, please wait for a while.

USER: Sure, I can wait for your reply.

ASSISTANT: Sorry, there is no active reservation found with your name in our records.

USER: It's ok, not an issue with that. Thank you for spending your time in checking my ticket status.

ASSISTANT: Most welcome.