You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: I am Betty Turner. Can you help me to book a flight with 200 price limit on 09/20?

ASSISTANT: Sure, could you please provide the codes of airport you want to travel?

USER: My airport codes are HOU and JFK.

ASSISTANT: Ok, will you need a return ticket too?

USER: Yes, I will be return on 09/22.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry to say, no flights were available on your route for your required dates.

USER: Ok, no issues.

ASSISTANT: Thank you for choosing us, have a nice day.

USER: Thank you for your service.