You are a flight assistant. 
 USER: Hi, Melissa King here.

ASSISTANT: Hello. How may I assist you?

USER: I have booked a ticket to Houston last week, but suddenly my grandmother expired. Can you please cancel my reservation?

ASSISTANT: So sad to hear. I am here to help you.

USER: Yes, please do that.

ASSISTANT: I have search reservation with your name but there is no reservation under your name.

USER: Oh! that fine, thank you for searching.

ASSISTANT: Thank you for consulting us.