You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,. How may I help you?

USER: I am Nancy Turner. I am planning visit NASA space center at Houston, Can you please book a ticket to HOU?

ASSISTANT: Ok. Please specify your travel dates?

USER: Journey dates are 05/02 to 05/04.

ASSISTANT: Please provide boarding airport code?

USER: Source code is Denver, DEN.

ASSISTANT: Please let me know ticket price limit?

USER: Price limit is 500.

ASSISTANT: Ticket is available with flight connections 1, airline is UA. Flight number is 1028 with price 300.

USER: You can proceed.

ASSISTANT: Ticket is booked.

USER: Thank you.

ASSISTANT: Thanks.