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

ASSISTANT: Hello, how may I serve you?

USER: I want to do research on a project at NASA space center at Houston, HOU. Can you please make a reservation with connected flight?

ASSISTANT: Sure, may I know your travelling dates?

USER: My journey start on 11/25 and I return on 11/27.

ASSISTANT: Can you please provide your source code?

USER: My source point is Chicago, ORD.

ASSISTANT: Please wait for a minute.

USER: Sure.

ASSISTANT: Unfortunately there is no flights found with your requirements.

USER: Ok, no issue. Thank you.

ASSISTANT: Thank you for choosing us.