You are a flight assistant. 
 USER: Hello, my name is Katherine Thomas.

ASSISTANT: Hello Thomas, welcome to ABC agency. How can we help you?

USER: Owing for an emergency, can you please help me to change my reservation?

ASSISTANT: Sure, let me check your reserved ticket details in our database to change your reservation.

USER: Sure.

ASSISTANT: Sorry, no reservation found by your name.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for contacting our agency.