You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how may I support you today?

USER: I am Patricia Thompson. I want to book a flight ticket to attend my nephew's birthday in Houston.

ASSISTANT: Sure, May I know your travelling details?

USER: My travelling dates from 10/15 to 10/17. My source from TX - IAH and my destination is TX - HOU.

ASSISTANT: Thank you for the details provided. Please wait a moment, I will search suitable flight with your given details.

USER: Sure.

ASSISTANT: Thank you for waiting, We are sorry to inform you that there were no flights based on your information.

USER: Ok, not an issue, Thank you, for your service.

ASSISTANT: Thank you for approaching us, Hope to serve you again. Have a nice day.