You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you?

USER: I want to book a ticket to Oakland, CA from Houston, TX, will you please aid me?

ASSISTANT: Sure, I am here to help you out. May I know your travelling dates please?

USER: Ok, My depart is on June 7th and return date was on June 9th.

ASSISTANT: Can you please share your connection limit?

USER: Yes, I want one connection between my journey.

ASSISTANT: Is there any class preference?

USER: I want to book my ticket in normal-cost, can you please check for it?

ASSISTANT: Can you please share your airport codes?

USER: I have already mention above.

ASSISTANT: May I know your name please?

USER: You can call me David Edwards.

ASSISTANT: Wait a moment please, in the mean while you can share your other specifications.

USER: No, I don't want any other specifications you can proceed.

ASSISTANT: David Edwards, there are no flights available in your route.

USER:  No problem, thank you for assisting me.

ASSISTANT: Thank you for choosing us.