You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: Due to inconvenience of my work, I want to change my reservation. Can you please help me for that?

ASSISTANT: Sure, may I know on which name the ticket has been reserved?

USER: My name is Larry Allen.

ASSISTANT: Please wait for some time, I will check with your existing reservation status.

USER: Ok, I will wait.

ASSISTANT: Thank you for waiting.

USER: Anyway, thanks for the information.

ASSISTANT: Here, there is no active reservation have been found under your name in our database to amend it. Thank you for reaching us.

USER: Thanks for checking.