You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you from flight booking agency?

USER: I need to change my reservation which I have done to spend free time with my friends but my leaves got postponned. So, can you please help me with that?

ASSISTANT: Sure, I am happy to help you with this. Can you please provide your name to search for the reservation status?

USER: Sure, please check the reservation with name of Timothy Hernandez.

ASSISTANT: Hold on a moment please.

USER: Sure, take your time.

ASSISTANT: Sorry to inform you, there is no reservation found with the name Timothy Hernandez in our database.

USER: Oh! May be I did not booked properly.

ASSISTANT: Thank you for utilising our services.

USER: Anyway, thank you for your time.