You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I help you?

USER: Can you please reserve my flight ticket from IAH to OAK?

ASSISTANT: Let me know your travelling dates.

USER: My travelling dates are Oct 26th and Oct 28th.

ASSISTANT: Do you have any preference?

USER: I prefer to travel with normal-cost such as UA, AA, Delta and Hawaiian airlines. I need a way station.

ASSISTANT: Can I know your name?

USER: This is Jeffrey Thompson.

ASSISTANT: Sorry, no flights found for your travelling dates.

USER: Ok, not an issue. Thank you.

ASSISTANT: Thank you.