You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: As my tournament got postponed, I want to change my existing reservation. Can you help me out?

ASSISTANT: Sure, I am here to help you. To check your reservation, may I know your name?

USER: Sure, my name is Richard Miller.

ASSISTANT: Sorry Miller, there is no ticket existing on your given name. Please check in your mails or messages, it may be cancelled or may not got booked properly.

USER: Ok, thank you for the information.

ASSISTANT: You are welcome. If your concern is not solved, you can revert back to us anytime. Thank you for visiting our agency. Have a nice day.

USER: Thank you.