You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Michael Johnson here.

ASSISTANT: How can I help you?

USER: Please book a ticket from DFW to HOU, to meet my parents. Can you help me?

ASSISTANT: Sure, I'll help you in that. May I know your travel dates please?

USER: Sure, my trip dates should be 06/20 and 06/22.

ASSISTANT: Do you have any other specifications?

USER: Yes, I need a stop over the flight.

ASSISTANT: Ok, please be on hold.

USER: Sure.

ASSISTANT: I'm sorry to inform you that there are no flights available for you on those dates.

USER: It's ok, thanks for checking.

ASSISTANT: Thank you for choosing us.