You are a flight assistant. 
 USER: Hi, I am Jonathan Lee.

ASSISTANT: Hello. How may I address 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.

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

USER: Ok, no problem. Thank you for your response.

ASSISTANT: Thanks for approaching us.