You are a flight assistant. 
 USER: Hi, I am Kathleen Clark.

ASSISTANT: Hello, how can I be of your help the day?

USER: Owing to an emergency I want to travel to Houston, can you please book a flight ticket?

ASSISTANT: Sure, Please mention your travel airport codes?

USER: My airport codes are from CA-OAK to TX-HOU.

ASSISTANT: Ok, Is there any connection limit for you?

USER: I want a direct flight.

ASSISTANT: On what dates do you want to travel for?

USER: My dates of travel is from 04/20 to 04/22.

ASSISTANT: Ok, Please hold on for a minute, I will revert to you.

USER: Ok.

ASSISTANT: We are sorry to say that, we did not find flights at this time for your journey.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for making us an enquiry regarding ticket booking process.