You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: My name is Nicholas Robinson.

ASSISTANT: Yes Robinson.

USER: Mistakenly I booked my source code as destination code, can you please help me in changing these codes?

ASSISTANT: sure. But I did not found any reservations.

USER: It's ok. Thank you.

ASSISTANT: Thank you for contacting us. You are welcome.