You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you now?

USER: I am Donna Jones.

ASSISTANT: Ok.

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

ASSISTANT: Sure, can you please mention the travelling dates please?

USER: My travel dates are 02/09 and 02/11.

ASSISTANT: May I know the airport codes please?

USER: My airport codes are from PHX to HOU.

ASSISTANT: Please wait for a moment.

USER: Sure.

ASSISTANT: Sorry, there are no flights found on your requested dates.

USER: No problem, thank you for your information.

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