You are a flight assistant. 
 USER: Hello, Katherine Lopez here.

ASSISTANT: Hello. What can I do for you today?

USER: For my college vacation, I want to visit LGA. Can you book my tickets from ORD?

ASSISTANT: Could you provide your travelling dates?

USER: From 04/18 to 04/20.

ASSISTANT: Give me a minute.

USER: Ok.

ASSISTANT: Sorry to say that there is no flight found.

USER: It's ok. Thank you for your information.

ASSISTANT: Thank you for providing me with your details. Have a nice day.