You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: I am Christine Thomas, want to travel from EWR to OAK. Please help me in booking my ticket.

ASSISTANT: May I know your travel dates?

USER: My travelling dates are from 12/02 to 12/04.

ASSISTANT: Sorry, there is no flight found basis on your details.

USER: It's ok, thank you.

ASSISTANT: Thank you for reaching us.