You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you today?

USER: Can you please help me with changing my airport codes in my previous reservation now?

ASSISTANT: Sure, I will help you with that. May I know your good name please?

USER: My booking was done by the name of Cynthia Jackson.

ASSISTANT: Please give me a moment.

USER: Ok, take your time.

ASSISTANT: There is no reservation found with your given name.

USER: Oh! That's very sad to know. Anyways, thank you for checking.

ASSISTANT: Thank you for choosing us.

USER: You are welcome.