You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you now?

USER: I am Larry Hernandez, want to alter my recent reservation due to some emergency. Please help me out with that.

ASSISTANT: Ok, I will help with that concern. Please wait a moment I will check.

USER: Sure.

ASSISTANT: Thank you for waiting, sorry there is no reservation been done on your name to change the reservation.

USER: It's ok, thank you for your help.

ASSISTANT: Thank you for choosing our agency.