You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you at this moment?

USER: I am planning for some other trip, so I need to change my trip details in the previous ticket. Can you help me in modifying it?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Can you please provide your good name to check for the reservation status?

USER: Yes, the name in the previous ticket is Christopher Roberts.

ASSISTANT: Christopher Roberts, there is no reservation found with your name in our database to change it.

USER: It's ok, no issues.

ASSISTANT: Thank you for availing us.

USER: Anyway's thank you for the information.