You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I help you?

USER: I have planned a trip from IAH to SFO to enjoy my holidays, can you book a ticket for me?

ASSISTANT: Sure, please share your journey dates?

USER: Thank you and I want to take off on June 7 and I will catch the return flight on June 9.

ASSISTANT: Do you have any specifications?

USER: Check the flight with a direct one.

ASSISTANT: Is there any class preferences?

USER: No.

ASSISTANT: May I know your good name?

USER: Sure, my name is Michelle Wilson.

ASSISTANT: Sorry, no flights found on your given details.

USER: Sad to hear that one, thank you for your service.

ASSISTANT: Thank you for choosing us.