You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I support you?

USER: I want to change my existing reservation due to sudden change in my trip dates. Can you help me with that?

ASSISTANT: Sure, we are here to aid you.

USER: Thank you.

ASSISTANT: Please mention your good name.

USER: Sure, I am Sarah Jones.

ASSISTANT: Ok Sarah Jones, please wait for a while.

USER: Sure.

ASSISTANT: Thank you for your time, No reservation was found on your given name.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for choosing us.