You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: I am Mary Harris. I have reserved my flight ticket in the month of may to Boston but I need to change my reservation to Houston, please help me out?

ASSISTANT: Sure, I am here to help you. Please wait a moment I will check your details and proceed further.

USER: Ok, sure take your own time I will wait for your reply.

ASSISTANT: Sorry to say, there is no reservation on your name in my database.

USER: Ok, fine thank you for checking.

ASSISTANT: Thank you for reaching us, have a nice day.