You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Joshua Garcia here. I want to change my existing reservation due to tornado in Atlanta, can you help me?

ASSISTANT: Sure, I can help you better. Please wait a minute. I will check the reservation list and revert to you.

USER: Ok, take your time and let me know my reservation status.

ASSISTANT: Sorry, no reservation has been found with your name in our database. Thanks for consulting us, have a good day.

USER: Oh! That's very sad to hear from you. Anyways, thank you for checking.

ASSISTANT: It's my job.

USER: You are most welcome.