You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I be your helping hand today?

USER: Owing to emergency, I just want to change my existing reservation. Can you please help me with some modifications?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: Ok, please mention your name.

USER: Sure, my name is Robert Lopez.

ASSISTANT: Ok, please wait for a moment.

USER: Sure.

ASSISTANT: Thank you for waiting, we did not find any reservation on your given name.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for contacting us.