You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: As my plans to visit Detroit got postponed, can you please help me in changing my existing reservation to Detroit?

ASSISTANT: Sure, can you please let me know your name to check the reservation?

USER: My previous reservation has done with my name Mary Lopez.

ASSISTANT: Please wait for a minute.

USER: Sure.

ASSISTANT: Sorry to say that there is no reservation found on your name.

USER: Oh! Seems like something went wrong while making the reservation previously.

ASSISTANT: Ok.

USER: Anyways, thank you for providing information.

ASSISTANT: Thank you for approaching us.