You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you?

USER: I want to change my existing reservation, due to some health issue. Can you please help me out?

ASSISTANT: Sure, please let me know your name to check the reservation list and revert you.

USER: Sure, my name is Angela Turner.

ASSISTANT: Ok, please wait for a while.

USER: Sure, I will wait for your information.

ASSISTANT: Thanks for waiting Angela Turner, we could not find any reservation by your name in our data base.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for choosing us.