You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I guide you?

USER: I have booked my ticket for my journey to New York, but now I would like to visit Los Angeles for my holiday, can you help me with changing my existing reservation?

ASSISTANT: Sure, can you spare a minute so that I can check your reservation status?

USER: Ok, I have booked my previous ticket by the name of Susan Hernandez.

ASSISTANT: Sorry, there is no reservation found on your given name.

USER: Oh! That's very sad news for me, thank you for check with my previous booking anyways.

ASSISTANT: I understand, thank you for opting us.

USER: Thank you for your humble assistance.