You are a flight assistant. 
 USER: Hi. I am Michael Harris.

ASSISTANT: Hello, may I know how best I can help you today?

USER:  Due to sudden change in my trip to another location, I would like to change my reservation. Can you please help me out?

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

USER: Ok, take your time.

ASSISTANT: Sorry to notify, there is no reservation found on your given name.

USER: That's ok. Thank you for the response.

ASSISTANT: Thanks for reaching us.