You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. What kind of service you are looking for?

USER: I want to change my reservation because I have an urgent work at my office, can you please help me with changing my reservation?

ASSISTANT: Please give me a moment to check your ticket details in our website.

USER: Sure, the reservation was done on the name of Catherine King.

ASSISTANT: Sorry King, no reservation is available by your name.

USER: No problem, thank you for checking.

ASSISTANT: Thank you for reaching us.