You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: I am Christine Nelson. I want to book a ticket from HOU to OAK, can you help me?

ASSISTANT: Sure, may I know your travel dates?

USER: My travel dates are 04/14 and 04/16.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry, there were no flights found on your route.

USER: No problem, thanks for checking.

ASSISTANT: Thank you.