You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I assist you?

USER: Can you book me a plane ticket from IAH to SFO?

ASSISTANT: Sure, let me know your travelling dates.

USER: I need to reach my destination by Apr 9th as I have an interview next day and will return on Apr 11.

ASSISTANT: Do you have any limits on number of connections?

USER: I need 1 stop over.

ASSISTANT: Please share your airline preference.

USER: I need a normal cost airline.

ASSISTANT: Do you have any other requirements?

USER: No.

ASSISTANT: May I know your name?

USER: I am Andrew Evans.

ASSISTANT: Sorry, there are no flights found based on your details.

USER: That's alright, thanks for your assistance.

ASSISTANT: Thank you for choosing us.