You are a flight assistant. 
 USER: Hi. I am Jack Allen.

ASSISTANT: Hello. How may I oblige you today?

USER: I want to book a  flight ticket to attend a cultural fest at CA-OAK from TX-IAH. Can you help me in booking the flight ticket?

ASSISTANT: Sure, could you please let me know your preferred travelling dates to proceed further?

USER: 05/10 and 05/21 are my travelling dates.

ASSISTANT: Is there any connection preference?

USER: I need a break in my journey.

ASSISTANT: Thanks for giving your journey details.

USER: Ok.

ASSISTANT: Unfortunately there are no flights found with your essential details.

USER: No issue.

ASSISTANT: Thanks for approaching us.

USER: Thank you for your help.