You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, How can I help you?

USER: I am Barbara Davis, want to travel from EWR to LAX. Please help me.

ASSISTANT: Please help me with your travel dates.

USER: My travel dates are from 07/26 to 07/28.

ASSISTANT: Please wait a minute.

USER: Ok.

ASSISTANT: Sorry, No flights found with your preferable dates.

USER: It's ok, thank you for your help.

ASSISTANT: Thank you for opting us.