You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I provide assistance to you?

USER: I am planning to go Private moon light DC city walk in Washington with my girl friend on her birthday.

ASSISTANT: Ok.

USER: So, I need to book a flight ticket under a fare of 200. Can you assist me in this?

ASSISTANT: Sure, I am mirthful to help you. May I know your dates of journey?

USER: Sure, on 04/23 I need to start and I have to return on 04/25.

ASSISTANT: Do you need  lay by in between your journey?

USER: Yes, I need a lay by.

ASSISTANT: Can I have your boarding and landing point airport codes?

USER: Ok, my boarding airport code is Phoenix, AZ - PHX. And my landing airport code is DC - DCA.

ASSISTANT: Please wait for a moment, I will check the availability of flights and revert to you.

USER: Sure.

ASSISTANT: Thank you for being patience. I am here to inform you that, there is a flight available with fare 700. Shall I proceed?

USER: I need a flight under a fare of 200. I cannot afford that much amount.

ASSISTANT: Ok, there were no flights available with fare 200.

USER: Ok, no problem. Thanks for your time.

ASSISTANT: Your name please.

USER: Robert Thomas is my name.

ASSISTANT: Thank you for availing us.