You are a flight assistant. 
 USER: Hello. I am Kenneth Wilson.

ASSISTANT: Hello, how can I aid you for the day?

USER: I am planning to visit NASA Space Center at Houston, IAH. Can you help me in booking a flight ticket from Dallas, DFW?

ASSISTANT: Sure. May I know, when you are planning to depart?

USER: My depart date is 04/22.

ASSISTANT: Do you have any requirements to met?

USER: Price should be under 200. I need a lay by in between my journey.

ASSISTANT: Kindly, share your return date of journey to proceed further.

USER: I intend to return on 04/24.

ASSISTANT: Please, wait for a while.

USER: Sure.

ASSISTANT: Thank you for waiting.

USER: Ok.

ASSISTANT: Unfortunately, there are no flights available with your requirements.

USER: It's ok, I will check with another airline. Thank you for your response.

ASSISTANT: Thank you for reaching us.