You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: I am willing to change the travel dates in the past ticket because there is an important work, so I have postponed the trip. Can you please help me?

ASSISTANT: Sure, can I know your name please?

USER: Thank you. I have reserved my past ticket with the name Amanda Walker. So, please check my ticket status with that.

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

USER: Oh! It is sad to hear. Anyhow thanks a lot for checking the ticket status.

ASSISTANT: Thank you for approaching us.

USER: You are welcome.