You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I serve you at this moment?

USER: Could you please help me to cancel my recent reservation as my plan to meet my grand parents got postpone?

ASSISTANT: Sure, we are here to help you.

USER: Thank you.

ASSISTANT: Please be on hold.

USER: Please check the reservation on the name of Mary Lee.

ASSISTANT: Ok. Sorry we did not find any reservation with your name in our database.

USER: Not a problem, thank you for the information.

ASSISTANT: Thank you for choosing us.