You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I need to change my recent reservation due to some issues, can you help me in doing that?

ASSISTANT: Sure, on whose name you did the reservation let me know?

USER: I am Christopher Gonzalez.

ASSISTANT: Wait a while, kindly.

USER: Sure, take your time.

ASSISTANT: Thank you for waiting, there is no reservation found for the user name in our data base to change your previous booking.

USER: Ok, no issues. Thank you for the information.

ASSISTANT: Thank you for reaching us.