You are a flight assistant. 
 USER: Hello. Larry Collins here.

ASSISTANT: Hello, how can I assist you today?

USER: I am looking to change my reservation. can you please help me out with that?

ASSISTANT: Sure, please wait for a moment.

USER: Ok, take your time.

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

USER: Oh! Not an issue. Anyway, thank you for the information.

ASSISTANT: Thank you for opting us.

USER: Welcome.