You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I assist you today?

USER: Sandra Thompson here. I would like to visit Houston for a business meeting, can you please reserve a flight ticket from OAK to HOU?

ASSISTANT: Sure, please share me your journey dates?

USER: Thank you, my departure is on Nov 09 and please book my return ticket also on Nov 11.

ASSISTANT: Do you have any airline preference?

USER: Yes, I will prefer a low cost airlines.

ASSISTANT: May I know your class preference?

USER: No.

ASSISTANT: Please wait for a moment.

USER: Sure, take your time.

ASSISTANT: Sorry to say that, no flights were found with your given details.

USER: Oh! Sad to hear that. Anyway, I will find another alternative to reach my destination. Thank you for your information.

ASSISTANT: Thank you for reaching us.

USER: Welcome.