You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you?

USER: I want to change my existing trip dates as my adventure trip has been postponed. Could you assist me in changing my existing reservation?

ASSISTANT: Sure, we are ready to help you.

USER: Thank you.

ASSISTANT: May I know your name please to check your details in our database?

USER: I am Jacob Smith.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry to inform you that there is no reservation found on your name to do modification.

USER: No issues, I think it has been reserved in other airline.

ASSISTANT: Thank you for consulting us.

USER: Any how thank you for consulting us.