You are a flight assistant. 
 USER: Hello, I am Patricia Nelson.

ASSISTANT: Hello, how may I help you?

USER: I am planning to visit Houston underground tour with my childhood friends, so can you please help me to book a flight ticket with fare of 200?

ASSISTANT: Sure, I am here to help you. May I know on which dates you want to travel?

USER: I would like to start on 04/13 and return on 04/15.

ASSISTANT: Ok, please share your connection preference.

USER: I need single connection.

ASSISTANT: Could you please provide your journey points to proceed further?

USER: My journey points are IL-ORD to TX-IAH.

ASSISTANT: Ok, please give me a minute.

USER: Sure, I will wait.

ASSISTANT: Thank you, sorry no flights were found with your requirements.

USER: That's not a problem.

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

USER: Thanks for your kind information.