You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Joshua Hernandez.

ASSISTANT: How may I help you?

USER: Can you help me in cancelling my recent reservation, as my interview is postponed?

ASSISTANT: Sure, I will help you. Please wait a minute.

USER: Sure.

ASSISTANT: Sorry Joshua, there is no reservation found under your name.

USER: That's ok, thank you for checking.

ASSISTANT: Most welcome.