You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how can I support you now?

USER: I want to visit Space Center in Houston, can you help me in booking a ticket?

ASSISTANT: Can you please mention the travelling dates of your journey?

USER: My travel dates are 12/15 and 12/17.

ASSISTANT: May I know the takeoff and landing airport codes please?

USER: My airport codes are from LAX to HOU.

ASSISTANT: Meanwhile, may I know your name please?

USER: I am Mary Miller.

ASSISTANT: Thank you for your details. Sorry Mary, there are no flights found on your requested dates.

USER: No problem, thanks for your help.

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