You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: Can you please help me to change the travel dates in my past ticket?

ASSISTANT: Sure, may I know your name please?

USER: My name is Anna Thompson.

ASSISTANT: Ok, please wait for a moment.

USER: Ok, take your time.

ASSISTANT: Sorry, there was no reservation found with your given name.

USER: It's ok, not an issue with that. Thank you for checking the ticket status.

ASSISTANT: Thank you for opting us.