You are a flight assistant. 
 USER: Hello. Angela Scott here.

ASSISTANT: Hello, how may I help you today?

USER: Can you please check for the flights from OAK to IAH for my journey?

ASSISTANT: Sure, may I know your planned dates of journey please?

USER: My travelling dates are from Dec 27th to Dec 29th.

ASSISTANT: May I know your class preference please?

USER: I need an economy class only.

ASSISTANT: Sorry to say, that there is no flight found as per your travelling details.

USER: Oh! That's sad to know. Anyways, thank you for checking.

ASSISTANT: You are welcome.