You are a flight assistant. 
 USER: Hello, Lisa Gonzalez here.

ASSISTANT: Hello.

USER: I am looking for a flight to travel from LAS to OAK, can you please help me?

ASSISTANT: Sure, please provide your dates too.

USER: From 07/01 to 07/03.

ASSISTANT: Ok, there is no flight for you. Sorry for the inconvenience.

USER: It's ok. Thank you.

ASSISTANT: Thank you for choosing us.