You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Ryan Turner.

ASSISTANT: How may I help you today?

USER: I want to book a ticket from Houston, HOU to attend wedding party of my cousin at Chicago, ORD. Please make a reservation.

ASSISTANT: Sure, help me with the trip dates?

USER: My trip dates are on 12/19 and 12/21.

ASSISTANT: Do you have any price limit?

USER: Price limit is 1000.

ASSISTANT: Thank you for your details, there are no flights running in your preferred dates.

USER: Ok, thank you for informing.

ASSISTANT: Thank you for opting us. Have a nice day.