You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: Daniel King here. I would like to visit Houston for a business trip, can you please reserve a flight ticket from OAK to HOU?

ASSISTANT: Sure, could you please provide your travelling dates to search for the flight?

USER: My departure is on Apr 07 and please book my return ticket also on Apr 09.

ASSISTANT: Do you need any halt in between your journey?

USER: Yes, I will prefer single connection for my journey.

ASSISTANT: Sorry to say, there is no flight is available for you.

USER: Oh! Sad to hear that. Anyway, I will prefer another alternative to reach my destination. Thank you for your information.

ASSISTANT: Welcome.