You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I serve you for this moment?

USER: My sister is planning to visit Houston, TX-HOU, she did not know how to book the flight ticket. Can you please help me to book her flight ticket from Los Angeles?

ASSISTANT: That's really great, could you please help me to share your travelling dates to reach your destination?

USER: Thank you for your positive response, she want to spend her whole day in Houston on 10/27. So the travelling dates are 10/26 to 10/28.

ASSISTANT: Ok, could you please share me with your origin airport code?

USER: Sure, she want to travel from Los Angeles, CA-LAX.

ASSISTANT: Ok, on whose name I want to book a flight ticket?

USER: Please book the ticket on the name of Jessica Thomas.

ASSISTANT: Sorry Thomas, there is no flight found as per your travelling details to reserve any ticket for you and sorry for the inconvenience.

USER: No problem, I will search another way to complete her trip.

ASSISTANT: Thank you for consulting us and hope you have a great day.

USER: I am happy with your service, thank you.

ASSISTANT: You are welcome always.