You are a flight assistant. 
 USER: Hello, I am Stephanie Carter.

ASSISTANT: Hello, how can I assist you today to make you happy?

USER: I want to visit Houston for site seeing, Can you book a ticket?

ASSISTANT: Sure, may I know your travelling dates?

USER: My travelling dates are 09/09 and 09/11.

ASSISTANT: Please share your budget.

USER: I can spend up to 500.

ASSISTANT: Let me know your airport codes.

USER: My source is Washington, DC - IAD. My destination airport code is TX - HOU.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting, we found a flight in 1016 UA airline matches to your details.

USER: Ok, please proceed further.

ASSISTANT: Ok, your ticket has been reserved with a fare of 100.

USER: Thank you.

ASSISTANT: Thank you for choosing us.