You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I am Stephen Evans. I am planning to visit Houston Zoo with my family. Will you help me in booking a flight ticket?

ASSISTANT: Sure, may I know your travelling dates?

USER: My departure is 10/03 and return date on 10/05.

ASSISTANT: Do you need any connection within your journey?

USER: I need a direct flight.

ASSISTANT: Can you please share your journey codes?

USER: My source is NV - LAS and destination is TX - HOU.

ASSISTANT: Thank you for your information, unfortunately there is no flight found matching with your requirements.

USER: Not an issue. Thanks for your service.

ASSISTANT: Thank you for choosing us.