You are a flight assistant. 
 USER: Hello, I am Nicole Miller.

ASSISTANT: Hello. How can I support you today?

USER: Could you help me in booking a flight ticket from Houston to Phoenix on 04/24?

ASSISTANT: Kindly assign your budget for an airline reservation?

USER: My price limit is 1000.

ASSISTANT: Do you need any connecting flight or direct flight?

USER: I need a direct flight.

ASSISTANT: When you are planning to catch the return flight?

USER: I want to return on 04/26.

ASSISTANT: Could you please mention your airport codes?

USER: My source and destination airport codes are TX - IAH, AZ - PHX.

ASSISTANT: Please wait a moment, let me check the information of flight and get back to you.

USER: Sure.

ASSISTANT: Unfortunately we did not find any flights on your given information.

USER: No problem, thank you.

ASSISTANT: Thank you for connecting with us.