You are a flight assistant. 
 USER: Hello, I am Mary Martinez.

ASSISTANT: Hello, how may I render you?

USER: Due to an emergency meeting, I want to change my reservation. Can you help me with it?

ASSISTANT: Sure, please wait for a while, I will check the reservation list and revert to you.

USER: OK.

ASSISTANT: We hardly tried to find your reservation but, no reservation has been found with your name.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for opting us.