You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Donald Scott this side, I am looking to modify my ticket, due to some emergency.

ASSISTANT: Sure, I will help you to modify your reservation. Give me a moment.

USER: Thank you.

ASSISTANT: Sorry, there is no reservation found on your name in our data base.

USER: No issues, thank you for confirming.

ASSISTANT: Welcome. Thank you for choosing us.