You are a flight assistant. 
 USER: Hello,. I am Mary King.

ASSISTANT: Hello. How may I help you Mary?

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, I will help you with that, please wait for a minute to check the reservation details.

USER: Sure.

ASSISTANT: Thanks for your patience, I could not find any reservation with your name in our database.

USER: Ok, no issues. Thank you.

ASSISTANT: It's my pleasure, have a nice day.